However, senior American commanders, having faced fanatical enemies and experienced major logistical problems during World War II and the Korean War, insisted that a single, powerful .30 caliber cartridge be developed, that could not only be used by the new automatic rifle but by the new general-purpose machine gun (GPMG) in concurrent development. This culminated in the development of the 7.62×51 mm NATO cartridge.
The U.S. Army then began testing several rifles to replace the obsolete M1. Springfield Armory's T44E4 and heavier T44E5 were essentially updated versions of the M1 chambered for the new 7.62 mm round, while Fabrique Nationale submitted their FN FAL as the T48. ArmaLite entered the competition late, hurriedly submitting several AR-10 prototype rifles in the fall of 1956 to the U.S. Army's Springfield Armory for testing. The AR-10 featured an innovative straight-line barrel/stock design, forged aluminum alloy receivers, and with phenolic composite stocks. It had rugged elevated sights, an oversized aluminum flash suppressor and recoil compensator, and an adjustable gas system. The final prototype featured an upper and lower receiver with the now-familiar hinge and takedown pins, and the charging handle was on top of the receiver placed inside of the carry handle. For a 7.62 mm NATO rifle, the AR-10 was incredibly lightweight at only 6.85 lb (3.11 kg) empty. Initial comments by Springfield Armory test staff were favorable, and some testers commented that the AR-10 was the best lightweight automatic rifle ever tested by the Armory. In the end, the U.S. Army chose the T44, now named the M14 rifle, which was an improved M1 Garand with a 20-round magazine and automatic fire capability. The U.S. also adopted the M60 general-purpose machine gun (GPMG). Its NATO partners adopted the FN FAL and HK G3 rifles, as well as the FN MAG and Rheinmetall MG3 GPMGs.
This request ultimately resulted in the development of a scaled-down version of the Armalite AR-10, named the ArmaLite AR-15. The AR-15 was first revealed by Eugene Stoner at Fort Benning in May 1957. The AR-15 used .22-caliber bullets, which destabilized when they hit a human body, as opposed to the .30 round, which typically passed through in a straight line. The smaller caliber meant that it could be controlled in auto fire due to the reduced bolt thrust and free recoil impulse. Being almost one-third the weight of the .30 meant that the soldier could sustain fire for longer with the same load. Due to design innovations, the AR-15 could fire 600 to 700 rounds a minute with an extremely low jamming rate. Parts were stamped out, not hand-machined, so they could be mass-produced, and the stock was plastic to reduce weight.
In 1958, the Army's Combat Developments Experimentation Command ran experiments with small squads in combat situations using the M14, AR-15, and Winchester's Light Weight Military Rifle (WLWMR). The resulting study recommended adopting a lightweight rifle like the AR-15. In response, the Army declared that all rifles and machine guns should use the same ammunition and ordered full production of the M14. However, advocates for the AR-15 gained the attention of Air Force Chief of Staff General Curtis LeMay. After testing the AR-15 with the ammunition manufactured by Remington that Armalite and Colt recommended, the Air Force declared that the AR-15 was its 'standard model' and ordered 8,500 rifles and 8.5 million rounds. Advocates for the AR-15 in the Defense Advanced Research Projects Agency acquired 1,000 Air Force AR-15s and shipped them to be tested by the Army of the Republic of Vietnam (ARVN). The South Vietnam soldiers issued glowing reports of the weapon's reliability, recording zero broken parts while firing 80,000 rounds in one stage of testing, and requiring only two replacement parts for the 1,000 weapons over the entire course of testing. The report of the experiment recommended that the U.S. provide the AR-15 as the standard rifle of the ARVN, but Admiral Harry Felt, then Commander in Chief of Pacific Forces, rejected the recommendations on the advice of the U.S. Army.
Throughout 1962 and 1963, the U.S. military extensively tested the AR-15. Positive evaluations emphasized its lightness, "lethality", and reliability. However, the Army Materiel Command criticized its inaccuracy at longer ranges and lack of penetrating power at higher ranges. In early 1963, the U.S. Special Forces asked and was given permission, to make the AR-15 its standard weapon. Other users included Army Airborne units in Vietnam and some units affiliated with the Central Intelligence Agency. As more units adopted the AR-15, Secretary of the Army Cyrus Vance ordered an investigation into why the weapon had been rejected by the Army. The resulting report found that Army Materiel Command had rigged the previous tests, selecting tests that would favor the M14 and choosing match grade M14s to compete against AR-15s out of the box. At this point, the bureaucratic battle lines were well-defined, with the Army ordnance agencies opposed to the AR-15 and the Air Force and civilian leadership of the Defense Department in favor.
In January 1963, Secretary of Defense Robert McNamara concluded that the AR-15 was the superior weapon system and ordered a halt to M14 production. In late 1963, the Defense Department began mass procurement of rifles for the Air Force and special Army units. Secretary McNamara designated the Army as the procurer for the weapon with the Department, which allowed the Army ordnance establishment to modify the weapon as they wished. The first modification was the addition of a "manual bolt closure", allowing a soldier to ram in a round if it failed to seat properly. The Air Force, which was buying the rifle, and the Marine Corps, which had tested it both objected to this addition, with the Air Force noting, "During three years of testing and operation of the AR-15 rifle under all types of conditions the Air Force has no record of malfunctions that could have been corrected by a manual bolt closing device." They also noted that the closure added weight and complexity, reducing the reliability of the weapon. Colonel Harold Yount, who managed the Army procurement, would later state the bolt closure was added after direction from senior leadership, rather than as a result of any complaint or test result, and testified about the reasons: "the M-1, the M-14, and the carbine had always had something for the soldier to push on; that maybe this would be a comforting feeling to him or something."
After modifications, the new redesigned rifle was subsequently adopted as the M16:
Despite its early failures the M16 proved to be a revolutionary design and stands as the longest continuously serving rifle in US military history. It has been adopted by many US allies and the 5.56×45 mm NATO cartridge has become not only the NATO standard but "the standard assault-rifle cartridge in much of the world." It also led to the development of small-caliber high-velocity service rifles by every major army in the world. It is a benchmark against which other assault rifles are judged.
In July 1960, General Curtis LeMay was impressed by a demonstration of the ArmaLite AR-15. In the summer of 1961, General LeMay was promoted to U.S. Air Force chief of staff and requested 80,000 AR-15s. However, General Maxwell D. Taylor, chairman of the Joint Chiefs of Staff, advised President John F. Kennedy that having two different calibers within the military system at the same time would be problematic and the request was rejected. In October 1961, William Godel, a senior man at the Advanced Research Projects Agency, sent 10 AR-15s to South Vietnam. The reception was enthusiastic, and in 1962 another 1,000 AR-15s were sent. United States Army Special Forces personnel filed battlefield reports lavishly praising the AR-15 and the stopping power of the 5.56 mm cartridge and pressed for its adoption.
The damage caused by the 5.56 mm bullet was originally believed to be caused by "tumbling" due to the slow 1 turn in 14-inch (360 mm) rifling twist rate. However, any pointed lead core bullet will "tumble" after penetration into flesh, because the center of gravity is towards the rear of the bullet. The large wounds observed by soldiers in Vietnam were caused by bullet fragmentation created by a combination of the bullet's velocity and construction. These wounds were so devastating that the photographs remained classified into the 1980s.
However, despite overwhelming evidence that the AR-15 could bring more firepower to bear than the M14, the Army opposed the adoption of the new rifle. U.S. Secretary of Defense Robert McNamara now had two conflicting views: the ARPA report favoring the AR-15 and the Army's position favoring the M14. Even President Kennedy expressed concern, so McNamara ordered Secretary of the Army, Cyrus Vance, to test the M14, the AR-15, and the AK-47. The Army reported that only the M14 was suitable for service, but Vance wondered about the impartiality of those conducting the tests. He ordered the Army Inspector General to investigate the testing methods used; the inspector general confirmed that the testers were biased toward the M14.
In January 1963, Secretary McNamara received reports that M14 production was insufficient to meet the needs of the armed forces and ordered a halt to M14 production. At the time, the AR-15 was the only rifle that could fulfill a requirement of a "universal" infantry weapon for issue to all services. McNamara ordered its adoption, despite receiving reports of several deficiencies, most notably the lack of a chrome-plated chamber.
After modifications (most notably, the charging handle was re-located from under the carrying handle like the AR-10, to the rear of the receiver), the newly redesigned rifle was renamed the Rifle, Caliber 5.56 mm, M16. Inexplicably, the modification to the new M16 did not include a chrome-plated barrel. Meanwhile, the Army relented and recommended the adoption of the M16 for jungle warfare operations. However, the Army insisted on the inclusion of a forward assist to help push the bolt into battery if a cartridge failed to seat into the chamber. The Air Force, Colt, and Eugene Stoner believed that the addition of a forward assist was an unjustified expense. As a result, the design was split into two variants: the Air Force's M16 without the forward assist, and the XM16E1 with the forward assist for the other service branches.
In November 1963, McNamara approved the U.S. Army's order of 85,000 XM16E1s; and to appease General LeMay, the Air Force was granted an order for another 19,000 M16s. In March 1964, the M16 went into production and the Army accepted delivery of the first batch of 2,129 rifles later that year, and an additional 57,240 rifles the following year.
In March 1965, the Army began to issue the XM16E1 to infantry units. However, the rifle was initially delivered without adequate cleaning kits or instructions because advertising from Colt asserted that the M16's materials made the weapon require little maintenance, leading to a misconception that it was capable of self-cleaning. Furthermore, cleaning was often conducted with improper equipment, such as insect repellent, water, and aircraft fuel, which induced further wear on the weapon. As a result, reports of stoppages in combat began to surface. The most severe problem was known as "failure to extract"—the spent cartridge case remained lodged in the chamber after the rifle was fired. Documented accounts of dead U.S. troops found next to disassembled rifles eventually led to a Congressional investigation:
In February 1967, the improved XM16E1 was standardized as the M16A1. The new rifle had a chrome-plated chamber and bore to eliminate corrosion and stuck cartridges, and other minor modifications. New cleaning kits, powder solvents, and lubricants were also issued. Intensive training programs in weapons cleaning were instituted including a comic book-style operations manual. As a result, reliability problems were largely resolved and the M16A1 rifle achieved widespread acceptance by U.S. troops in Vietnam.
In 1969, the M16A1 officially replaced the M14 rifle to become the U.S. military's standard service rifle. In 1970, the new WC 844 powder was introduced to reduce fouling.
Colt, H&R, and GM Hydramatic Division manufactured M16A1 rifles during the Vietnam War. M16s were produced by Colt until the late 1980s when FN Herstal (FN USA) began to manufacture them.
During the early part of its service, the M16 had a reputation for poor reliability and a malfunction rate of two per 1000 rounds fired. The M16's action works by passing high-pressure propellant gasses, tapped from the barrel, down a tube and into the carrier group within the upper receiver. The gas goes from the gas tube, through the bolt carrier key, and into the inside of the carrier where it expands in a donut-shaped gas-piston cylinder. Because the bolt is prevented from moving forward by the barrel, the carrier is driven to the rear by the expanding gases and thus converts the energy of the gas to the movement of the rifle's parts. The back part of the bolt forms a piston head and the cavity in the bolt carrier is the piston sleeve. While the M16 is commonly said to use a direct impingement system, this is wrong, and it is instead correct to say it uses an internal piston system. This system is however ammunition specific, since it does not have an adjustable gas port or valve to adjust the weapon to various propellant and projectile or barrel length specific pressure behavior.
The original M16 fared poorly in the jungles of Vietnam and was infamous for reliability problems in harsh environments. Max Hastings was very critical of the M16's general field issue in Vietnam just as grievous design flaws were becoming apparent. He further states that the Shooting Times experienced repeated malfunctions with a test M16 and assumed these would be corrected before military use, but they were not. Many marines and soldiers were so angry with the reliability problems they began writing home and on 26 March 1967, the Washington Daily News broke the story. Eventually, the M16 became the target of a congressional investigation.
When these issues were addressed and corrected by the M16A1, the reliability problems decreased greatly. According to a 1968 Department of Army report, the M16A1 rifle achieved widespread acceptance by U.S. troops in Vietnam. "Most men armed with the M16 in Vietnam rated this rifle's performance high, however, many men entertained some misgivings about the M16's reliability. When asked what weapon they preferred to carry in combat, 85 percent indicated that they wanted either the M16 or its [smaller] carbine-length version, the XM177E2." Also, "the M14 was preferred by 15 percent, while less than one percent wished to carry either the Stoner rifle, the AK-47, the [M1] carbine or a pistol." In March 1970, the "President's Blue Ribbon Defense Panel" concluded that the issuance of the M16 saved the lives of 20,000 U.S. servicemen during the Vietnam War, who would have otherwise died had the M14 remained in service. However, the M16's reputation has suffered as of 2011.
Another underlying cause of the M16's jamming problem was identified by ordnance staff that discovered that Stoner and ammunition manufacturers had initially tested the AR-15 using DuPont IMR8208M extruded (stick) powder. Later ammunition manufacturers adopted the more readily available Olin Mathieson WC846 ball powder. The ball powder produced a longer peak chamber pressure with undesired timing effects. Upon firing, the cartridge case expands and seals the chamber (obturation). When the peak pressure starts to drop the cartridge case contracts and then can be extracted. With ball powder, the cartridge case was not contracted enough during extraction due to the longer peak pressure period. The ejector would then fail to extract the cartridge case, tearing through the case rim, and leaving an obturated case behind.
After the introduction of the M4 carbine, it was found that the shorter barrel length of 14.5 inches also harms the reliability, as the gas port is located closer to the chamber than the gas port of the standard length M16: 7.5 inches instead of 13 inches. This affects the M4's timing and increases the amount of stress and heat on the critical components, thereby reducing reliability. In a 2002 assessment, the USMC found that the M4 malfunctioned three times more often than the M16A4 (the M4 failed 186 times for 69,000 rounds fired, while the M16A4 failed 61 times). Thereafter, the Army and Colt worked to make modifications to the M4s and M16A4s to address the problems found. In tests conducted in 2005 and 2006 the Army found that on average, the new M4s and M16s fired approximately 5,000 rounds between stoppages.
In March 1970, the U.S. recommended that all NATO forces adopt the 5.56×45mm cartridge. This shift represented a change in the philosophy of the military's long-held position about caliber size. By the mid 1970s, other armies were looking at M16-style weapons. A NATO standardization effort soon started and tests of various rounds were carried out starting in 1977. The U.S. offered the 5.56×45mm M193 round, but there were concerns about its penetration in the face of the wider introduction of body armor. In the end, the Belgian 5.56×45mm SS109 round was chosen (STANAG 4172) in October 1980. The SS109 round was based on the U.S. cartridge but included a new stronger, heavier, 62-grain bullet design, with better long-range performance and improved penetration (specifically, to consistently penetrate the side of a steel helmet at 600 meters). Due to its design and lower muzzle velocity (about 3110 ft/s) the Belgian SS109 round is considered more humane because it is less likely to fragment than the U.S. M193 round. The NATO 5.56×45mm standard ammunition produced for U.S. forces is designated M855.
In October 1980, shortly after NATO accepted the 5.56×45mm NATO rifle cartridge. Draft Standardization Agreement 4179 (STANAG 4179) was proposed to allow NATO members to easily share rifle ammunition and magazines down to the individual soldier level. The magazine chosen to become the STANAG magazine was originally designed for the U.S. M16. Many NATO member nations, but not all, subsequently developed or purchased rifles with the ability to accept this type of magazine. However, the standard was never ratified and remains a 'Draft STANAG'.
The M16 is in use by 15 NATO countries and more than 80 countries worldwide.
The M16 internal piston action was derived from the original ArmaLite AR-10 and ArmaLite AR-15 actions. This internal piston action system designed by Eugene Stoner is commonly called a direct impingement system, but it does not use a conventional direct impingement system. In U.S. patent 2,951,424, the designer states: ″This invention is a true expanding gas system instead of the conventional impinging gas system.″ The gas system, bolt carrier, and bolt-locking design is ammunition specific, since it does not have an adjustable gas port or valve to adjust the weapon to various propellant and projectile or barrel length specific pressure behavior.
The M16A1 was especially lightweight at 7.9 pounds (3.6 kg) with a loaded 30-round magazine. This was significantly less than the M14 that it replaced at 10.7 pounds (4.9 kg) with a loaded 20-round magazine. It is also lighter when compared to the AKM's 8.3 pounds (3.8 kg) with a loaded 30-round magazine.
The M16A2 weighs 8.8 lb (4.0 kg) loaded with a 30-round magazine, because of the adoption of a thicker barrel profile. The thicker barrel is more resistant to damage when handled roughly and is also slower to overheat during sustained fire. Unlike a traditional "bull" barrel that is thick its entire length, the M16A2's barrel is only thick forward of the handguards. The barrel profile under the handguards remained the same as the M16A1 for compatibility with the M203 grenade launcher.
M193 ball and M196 tracer bullets may be fired in a rifle with a one turn in 7 in (1:177.8 mm or 32 calibers) twist barrel. NATO SS109 ball and L110 tracer bullets should only be used in emergency situations at ranges under 90 m (98 yd) with a one turn in 12 inches (1:304.8 mm or 54.8 calibers) twist, as this twist is insufficient to stabilize these projectiles.
Weapons designed to adequately stabilize both the M193 or SS109 projectiles (like civilian market clones) usually have a six-groove, right-hand twist, one turn in 9 inches (1:228.6 mm or 41.1 calibers) or one turn in 8 inches (1:203.2 mm or 36.5 calibers) bore, although other and 1:7 inches twist rates are available as well.
The M16 uses a "straight-line" recoil design, where the recoil spring is located in the stock directly behind the action, and serves the dual function of operating spring and recoil buffer. The stock being in line with the bore also reduces muzzle rise, especially during automatic fire. Because recoil does not significantly shift the point of aim, faster follow-up shots are possible and user fatigue is reduced. In addition, current model M16 flash-suppressors also act as compensators to reduce recoil further.
Notes: Free recoil is calculated by using the rifle weight, bullet weight, muzzle velocity, and charge weight. It is that which would be measured if the rifle were fired suspended from strings, free to recoil. A rifle's perceived recoil is also dependent on many other factors which are not readily quantified.
The M16's most distinctive ergonomic feature is the carrying handle and rear sight assembly on top of the receiver. This is a by-product of the original AR-10 design, where the carrying handle contained a rear sight that could be set for specific range settings and also served to protect the charging handle.
The M16 carry handle also provided mounting groove interfaces and a hole at the bottom of the handle groove for mounting a Colt 3×20 telescopic sight featuring a Bullet Drop Compensation elevation adjustment knob for ranges from 100 to 500 yd (91 to 457 m). This concurs with the pre-M16A2 maximum effective range of 460 m (503 yd). The Colt 3×20 telescopic sight was factory adjusted to be parallax-free at 200 yd (183 m). In Delft, the Netherlands Artillerie-Inrichtingen produced a roughly similar 3×25 telescopic sight for the carrying handle mounting interfaces.
The M16 elevated iron sight line has a 19.75 in (502 mm) sight radius. As the M16 series rear sight, front sight and sighting in targets designs were modified over time and non-iron sight (optical) aiming devices and new service ammunition were introduced zeroing procedures changed.
An alternative pre-M16A2 "Low Light Level Sight System", includes a front sight post with a weak light source provided by tritium radioluminescence in an embedded small glass vial and a two aperture rear sight consisting of a 2 mm (0.079 in) diameter aperture marked 'L' intended for normal use out to 460 m (503 yd) and a 7 mm (0.276 in) diameter large aperture for night firing. Regulation stipulates the radioluminescent front sight post must be replaced if more than 144 months (12 years) elapsed after manufacture. The "Low Light Level Sight System" elevation and windage adjustment increments are somewhat coarser compared to the "Daylight Sight System".
With the advent of the M16A2, a less simple fully adjustable rear sight was added, allowing the rear sight to be dialed in with an elevation wheel for specific range settings between 300 and 800 m (328 and 875 yd) in 100 m increments and to allow windage adjustments with a windage knob without the need of a cartridge or tool. The unmarked approximately 0.070 in (1.78 mm) diameter aperture rear sight is for normal firing situations, zeroing and with the elevation knob for target distances up to 800 meters. The downsides of relatively small rear sight apertures are less light transmission through the aperture and a reduced field of view. A new larger approximately 0.2 in (5.08 mm) diameter aperture, marked '0-2' and featuring a windage setting index mark, offers a larger field of view during battle conditions and is used as a ghost ring for quick target engagement and during limited visibility. When flipped down, the engraved windage mark on top of the '0-2' aperture ring shows the dialed in windage setting on a windage scale at the rear of the rear sight assembly. When the normal use rear aperture sight is zeroed at 300 m with SS109/M855 ammunition, first used in the M16A2, the '0-2' rear sight will be zeroed for 200 m. The front sight post was widened to approximately 0.075 in (1.91 mm) diameter and became square and became adjustable during zeroing in about 1.2 MOA increments.
The M16A4 omitted the carrying handle and rear sight assembly on top of the receiver. Instead, it features a MIL-STD-1913 Picatinny railed flat-top upper receiver for mounting various optical sighting devices or a new detachable carrying handle and M16A2-style rear sight assembly. The current U.S. Army and Air Force issue M4A1 carbine comes with the M68 close combat optic and back-up iron sight. The U.S. Marine Corps uses the ACOG Rifle Combat Optic and the U.S. Navy uses the EOTech holographic weapon sight.
The M16 is considered to be very accurate for a service rifle. Its light recoil, high-velocity and flat trajectory allow shooters to take headshots out to 300 meters. Newer M16s use the newer M855 cartridge increasing their effective range to 600 meters. They are more accurate than their predecessors and are capable of shooting 1–3-inch groups at 100 yards. "In Fallujah, Iraq Marines with ACOG-equipped M16A4s created a stir by taking so many headshots that until the wounds were closely examined, some observers thought the insurgents had been executed." The newest M855A1 EPR cartridge is even more accurate and during testing "...has shown that, on average, 95 percent of the rounds will hit within an 8 × 8-inch (20.3 × 20.3 cm) target at 600 meters."
The 5.56×45mm cartridge had several advantages over the 7.62×51mm NATO round used in the M14 rifle. It enabled each soldier to carry more ammunition and was easier to control during automatic or burst fire. The 5.56×45mm NATO cartridge can also produce massive wounding effects when the bullet impacts at high speed and yaws ("tumbles") in tissue leading to fragmentation and rapid transfer of energy.
The original ammunition for the M16 was the 55-grain M193 cartridge. When fired from a 20 in (510 mm) barrel at ranges of up to 300 feet (100 m), the thin-jacketed lead-cored round traveled fast enough (above 2,900 ft/s (880 m/s)) that the force of striking a human body would cause the round to yaw (or tumble) and fragment into about a dozen pieces of various sizes thus created wounds that were out of proportion to its caliber. These wounds were so devastating that many considered the M16 to be an inhumane weapon. As the 5.56 mm round's velocity decreases, so does the number of fragments that it produces. The 5.56 mm round does not normally fragment at distances beyond 200 meters or at velocities below 2500 ft/s, and its lethality becomes largely dependent on shot placement.
With the development of the M16A2, the new 62-grain M855 cartridge was adopted in 1983. The heavier bullet had more energy and was made with a steel core to penetrate Soviet body armor. However, this caused less fragmentation on impact and reduced effects against targets without armor, both of which lessened kinetic energy transfer and wounding ability. Some soldiers and Marines coped with this through training, with requirements to shoot vital areas three times to guarantee killing the target.
However, there have been repeated and consistent reports of the M855's inability to wound effectively (i.e., fragment) when fired from the short barreled M4 carbine (even at close ranges). The M4's 14.5-in. barrel length reduces muzzle velocity to about 2900 ft/s. This reduced wounding ability is one reason that, despite the Army's transition to short-barrel M4s, the Marine Corps has decided to continue using the M16A4 with its 20-inch barrel as the 5.56×45mm M855 is largely dependent upon high velocity in order to wound effectively.
In 2003, the U.S. Army contended that the lack of lethality of the 5.56×45mm was more a matter of perception than fact. With good shot placement to the head and chest, the target was usually defeated without issue. The majority of failures were the result of hitting the target in non-vital areas such as extremities. However, a minority of failures occurred in spite of multiple hits to the chest. In 2006, a study found that 20% of soldiers using the M4 carbine wanted more lethality or stopping power. In June 2010, the U.S. Army announced it began shipping its new 5.56 mm, lead-free, M855A1 Enhanced Performance Round to active combat zones. This upgrade is designed to maximize performance of the 5.56×45mm round, to extend range, improve accuracy, increase penetration and to consistently fragment in soft-tissue when fired from not only standard length M16s, but also the short-barreled M4 carbines. The U.S. Army has been impressed with the new M855A1 EPR round. A 7.62 NATO M80A1 EPR variant was also developed.
The M16's magazine was meant to be a lightweight, disposable item. As such, it is made of pressed/stamped aluminum and was not designed to be durable. The M16 originally used a 20-round magazine which was later replaced by a bent 30-round design. As a result, the magazine follower tends to rock or tilt, causing malfunctions. Many non-U.S. and commercial magazines have been developed to effectively mitigate these shortcomings, e.g., Heckler & Koch's all-stainless-steel "High-Reliability" magazine, Magpul's polymer P-MAG and E-MAG, etc.
Production of the 30-round magazine started late 1967 but did not fully replace the 20-round magazine until the mid-1970s. Standard USGI aluminum 30-round M16 magazines weigh 0.24 lb (0.11 kg) empty and are 7.1 inches (18 cm) long. The newer plastic magazines are about a half-inch longer. The newer steel magazines are about 0.5-inch longer and four ounces heavier. The M16's magazine has become the unofficial NATO STANAG magazine and is currently used by many Western nations, in numerous weapon systems.
In 2009, the U.S. military began fielding an "improved magazine" identified by a tan-colored follower. "The new follower incorporates an extended rear leg and modified bullet protrusion for improved round stacking and orientation. The self-leveling/anti-tilt follower minimizes jamming while a wider spring coil profile creates even force distribution. The performance gains have not added weight or cost to the magazines."
In July 2016, the U.S. Army introduced another improvement, the new Enhanced Performance Magazine, which it says will result in a 300% increase in reliability in the M4 carbine. Developed by the United States Army Armament Research, Development and Engineering Center and the Army Research Laboratory in 2013, it is tan colored with blue follower to distinguish it from earlier, incompatible magazines.
Most M16s have a barrel threaded in 1⁄2-28" threads to incorporate the use of a muzzle device such as a flash suppressor or sound suppressor. The initial flash suppressor design had three tines or prongs and was designed to preserve the shooter's night vision by disrupting the flash. Unfortunately it was prone to breakage and getting entangled in vegetation. The design was later changed to close the end to avoid this and became known as the "A1" or "bird cage" flash suppressor on the M16A1. Eventually on the M16A2 version of the rifle, the bottom port was closed to reduce muzzle climb and prevent dust from rising when the rifle was fired in the prone position. For these reasons, the U.S. military declared the A2 flash suppressor as a compensator or a muzzle brake; but it is more commonly known as the "GI" or "A2" flash suppressor.
The threaded barrel allows sound suppressors with the same thread pattern to be installed directly to the barrel; however this can result in complications such as being unable to remove the suppressor from the barrel due to repeated firing on full auto or three-round burst. A number of suppressor manufacturers have designed "direct-connect" sound suppressors which can be installed over an existing M16's flash suppressor as opposed to using the barrel's threads.
For use as an ad-hoc automatic rifle, the M16 and M16A1 could be equipped with the XM3 bipod, later standardized as the Bipod, M3 (1966) and Rifle Bipod M3 (1983). Weighing only 0.6 lb, the simple and non-adjustable bipod clamps to the barrel of the rifle to allow for supported fire.
This was the first M16 variant adopted operationally, originally by the U.S. Air Force. It was equipped with triangular handguards, buttstocks without a compartment for the storage of a cleaning kit, a three-pronged "duckbill" flash suppressor designed to preserve the shooter's night vision by disrupting the flash, full auto, and no forward assist. The M16 has a safe/semi/auto selective fire trigger group. Bolt carriers were originally chrome plated and slick-sided, lacking forward assist notches. Later, the chrome-plated carriers were dropped in favor of Army-issued notched and parkerized carriers, though the interior portion of the bolt carrier is still chrome-lined. The barrel rifling had a 1:12 (305 mm) twist rate to adequately stabilize the M193 ball and M196 tracer ammunition. The Air Force continued to operate these weapons until around 2001, at which time the Air Force converted all of its M16s to the M16A2 configuration.
The U.S. Army XM16E1 was essentially the same weapon as the M16 with the addition of a forward assist and corresponding notches in the chrome bolt carrier. A rib was built into the side of the receiver to help prevent accidentally pressing the magazine release button while closing the ejection port cover.
The M16A1 was the finalized production model and was produced from February 1967 until 1982. To address issues with the XM16E1, for the M16A1 a closed, birdcage symmetric flash suppressor with open side slots to the top, bottom, left and right replaced the XM16E1's three-pronged flash suppressor, which caught on twigs and leaves, from 1967 onwards. Various other changes were made after numerous problems in the field. Cleaning kits were developed and issued, while barrels with chrome-plated chambers and later fully lined bores were introduced. A small storage compartment inside the stock was introduced. Covered by a trapdoor with checkered anti-slip texturing, it is often used for storing a basic cleaning kit. To promote reliability and durability, the mechanical behavior of the operating system was revised to make it compatible for using US military issued ammunition loaded with WC846 ball powder (which reaches peak pressure significantly quicker than the extruded IMR8208M powder and increases the cyclic rate of fire for which the operating system was originally designed). Revisions like reducing the diameter of the gas port to mitigate the higher port pressure caused by the ball powder to properly gas the operating system again, updating the buffer assembly, changing the bolt carrier surface finish to manganese phosphate and the gas tube material to stainless steel contributed to improved mechanical behavior.
The rib was extended on production M16A1s to help in preventing the magazine release from inadvertently being pressed. The hole in the bolt that accepts the cam pin was crimped inward on one side, in such a way that the cam pin may not be inserted with the bolt installed backwards, which would cause failures to eject until corrected. With these and other changes, the malfunction rate slowly declined, and new soldiers were generally unfamiliar with early problems.
The M16A1 saw limited use in training capacities until the early 2000s, but is no longer in active service with the U.S., although is still standard issue in many world armies.
Modifications to the M16A2 were extensive. In addition to the then new STANAG 4172 5.56×45mm NATO chambering and its accompanying rifling, the barrel was made with a greater thickness in front of the front sight post, ostensibly to resist bending in the field and increase rigidity under sustained fire. The rest of the barrel was maintained at the original thickness for backwards compatibility with the M203 grenade launcher assembly. The barrel rifling was revised to a faster 1:7 (178 mm) twist rate to adequately stabilize the new 5.56×45mm NATO SS109/M855 ball and L110/M856 tracer ammunition. The heavier longer SS109/M855 bullet reduced muzzle velocity from 3,260 ft/s (994 m/s), to about 3,110 ft/s (948 m/s)
A new adjustable rear sight was added, allowing the rear sight to be dialed in for specific range settings between 300 and 800 meters to take full advantage of the ballistic characteristics of the SS109/M855 rounds, and to allow windage adjustments without the need of a tool or cartridge. The flash suppressor was again modified, this time to be closed on the bottom, so the new birdcage-type muzzle device would not kick up dirt or snow when being fired from the prone position, and additionally act as an asymmetric recoil compensator to reduce muzzle climb.
A spent case deflector was incorporated into the upper receiver immediately behind the ejection port to prevent (hot) cartridge cases from striking users shooting from the left shoulder. The action was also modified, replacing the original fully automatic setting with a three-round burst setting. When using a fully automatic weapon, inexperienced troops often hold down the trigger and "spray" when under fire. The U.S. Army concluded that three-shot groups provide an optimum combination of ammunition conservation, accuracy, and firepower. The number of rounds fired in a burst is determined by a cam mechanism that trips the trigger mechanism for each shot in the burst. For the burst the trigger must be held down for the full duration of the burst. The fire control group will terminate the burst if the trigger is released before the burst is complete but keep the cam in position. Thus, the next time the trigger is pulled, the weapon will only fire one or two rounds. The US Army and USMC have both retired the M16A2, in favor of the newer M4A1 carbine and M16A4 respectively; a few M16A2s remain in service with the U.S. Army Reserve and National Guard.
The handguard was modified from the original triangular shape to a round one, which better fit smaller hands and could be retrofitted to older models of the M16. The new handguards were also symmetrical, so armories did not need to stock separate left- and right-hand spares. The handguard retention ring was also tapered to make it easier to install and uninstall the handguards.
The new buttstock became ten times stronger than the original due to advances in polymer technology since the early 1960s. Original M16 stocks were made from cellulose-impregnated phenolic resin; the newer M16A2 stocks were engineered from DuPont Zytel glass-filled thermoset polymers and became a replacement part for the preceding M16A1. The new buttstock was lengthened by 5⁄8 in (15.9 mm), and whilst the hinged trapdoor and storage compartment inside the stock was retained, the anti-slip texturing now covers the entire buttplate for better grip on the shoulder.
The A2 barrel profile has a greater thickness from the front sight post to the muzzle, after bending in this area was reported in the field. Tests by the M16A2 team showed that this increased the resistance to intentional bending in this area by a factor 9. As to not further increase weight beyond acceptable levels, and to maintain commonality with the M203 grenade launcher, the rear half under the handguard maintained its original thin profile. After the new technical data was submitted, the team discovered that they had made an error in assessing the problem - the replaced bent barrels were not actually bent. When inspecting some using a borescope, they discovered that a burr left from drilling/reaming the gas port was causing copper fouling to build up at the front sight block, interfering with the gauge used. Cleaning this fouling caused the "bent" barrels to re-pass inspection. However this discovery came too late in the process to revert the change in profile.
A notch for the middle finger was added to the pistol grip as well as more aggressive texturing on the sides to enhance the grip, especially while wearing winter gloves. The new pistol grips were engineered from Zytel glass-filled thermoset polymers. The M16A2 pistol grip consequently became a replacement part for the preceding M16A1.
While the standard M16A2 (Model 645 in Colt nomenclature) features a three position safe/semi/three-round burst selective fire control group, there also exists a four position safe/semi/three-round burst/automatic selective trigger pack for the Model 708 version of the rifle named "M16A2 Enhanced", used by some international customers like the 32nd Marines Brigade of the Hellenic Army. It can be distinguished from the standard M16A2 by the presence of the embiggened fire selector lever, with a prominent triangular ridge and thumb dowel, as well as corresponding fire position markings on both sides of the receiver.
The M16A3 is a modified version of the M16A2 adopted in small numbers by the U.S. Navy SEALs, Seabees, some US security units, and the Philippine National Police. It features the M16A1 selective fire control group providing "safe", "semi-automatic" and "fully automatic" modes, and type-specific markings on the magazine well. Otherwise, it is externally identical to the M16A2, and should not be conflated with rifles built by armorers using existing full-auto lower receiver assemblies, or M16A1s retrofitted with newer M16A2 furniture.
Adopted in July 1997, the M16A4 is the fourth generation of the M16 series. It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices. The M16A4 rear aperture sights are adjustable from 300 m (330 yd) up to 600 m (660 yd), where the further similar M16A2 iron sights line can reach up to 800 m (870 yd). The introduction of the Picatinny rail required the use of a higher F-marked front sight base to raise the post. The FN M16A4, with safe/semi/three-round burst selective fire modes, became standard issue for the U.S. Marine Corps.
A study of significant changes to Marine M16A4 rifles released in February 2015 outlined several new features that could be added from inexpensive and available components. Those features included: a muzzle compensator in place of the flash suppressor to manage recoil and allow for faster follow-on shots, though at the cost of noise and flash signature and potential overpressure in close quarters; a heavier and/or free-floating barrel to increase accuracy from 4.5 MOA (Minute(s) Of Angle) to potentially 2 MOA; changing the reticle on the Rifle Combat Optic from chevron-shaped to a semi-circular reticle with a dot at the center used in the M27 IAR's Squad Day Optic so as not to obscure the target at long distance; using a trigger group with a more consistent pull force, even a reconsideration of the burst capability; and the addition of ambidextrous charging handles and bolt catch releases for easier use with left-handed shooters.
In 2014, Marine units were provided with a limited number of adjustable stocks in place of the traditional fixed stock for their M16A4s to issue to smaller Marines who would have trouble comfortably reaching the trigger when wearing body armor. The adjustable stocks were added as a standard authorized accessory, meaning units can use operations and maintenance funds to purchase more if needed.
The Marine Corps had long maintained the full-length M16 as their standard infantry rifle, but in October 2015 the switch to the M4 carbine was approved as the standard-issue weapon, giving Marine infantry a smaller and more compact weapon. Enough M4s were already in the inventory to re-equip all necessary units by September 2016, and all M16A4s were moved to support and non-infantry Marines.
These were used by the British Special Air Service during the Falklands War.
The M4 carbine was developed from various outgrowths of these designs, including a number of 14.5-inch (368 mm)-barreled A1 style carbines. The XM4 (Colt Model 720) started its trials in 1984, with a new 14.5 in (370 millimetres) "stepped" barrel, case deflector, M16A2 rear sight, and a new elliptical handguard. The weapon became type classified as the "Carbine, 5.56mm, M4" in 1991. Officially adopted as a replacement for the M3 "Grease Gun" (and the Beretta M9 and M16A2 for select troops) in 1994, it was used with great success in the Balkans and in more recent conflicts, including the Afghanistan and Iraq theaters. The M4 carbine has a three-round burst firing mode, while the M4A1 carbine has a fully automatic firing mode. Both have a Picatinny rail on the upper receiver, allowing the carry handle/rear sight assembly to be replaced with other sighting devices.
Colt also returned to the original "Commando" idea, with its Model 733, essentially a simplified XM177E2 with the flash hider/sound moderator deleted and replaced with a normal birdcage-style flash hider. Over the different production runs Colt would assemble the guns with whatever parts were on hand, sometimes leading to the mixing of different M16, M16A1, M16A1E1, and M16A2 features on individual guns.
The M5 carbine system was developed by Colt as an improvement on the M4 carbine. It incorporates a fully ambidextrous lower receiver, free-floating barrel and lengthened upper rail. The M5 carbine has four possible barrel lengths: 10.3, 11.5, 14.5 and 16.1 inches. Other M5 variants and calibers are the: M5 SCW (Sub-compact weapon) (5.56×45mm); M5 300 (.300 AAC Blackout); M5 SMG (9×19mm); CMK (7.62×39mm); M7 Battle Rifle (7.62×51mm) and Designated Marksman and Semi-Automatic Sniper System (both 5.56×45mm).
The Mk 4 Mod 0 was a variant of the M16A1 produced for the U.S. Navy SEALs during the Vietnam War and adopted in April 1970. It differed from the basic M16A1 primarily in being optimized for maritime operations and coming equipped with a sound suppressor. Most of the operating parts of the rifle were coated in Kal-Guard lubricant, a hole of 0.25 inches (6.4 mm) was drilled through the stock and buffer tube for drainage, and an O-ring was added to the end of the buffer assembly. The weapon could reportedly be carried to the depth of 200 feet (61 m) in water without damage. The initial Mk 2 Mod 0 Blast Suppressor was based on the U.S. Army's Human Engineering Lab's (HEL) M4 noise suppressor. The HEL M4 vented gas directly from the action, requiring a modified bolt carrier. A gas deflector was added to the charging handle to prevent gas from contacting the user. Thus, the HEL M4 suppressor was permanently mounted though it allowed normal semi-automatic and automatic operation. If the HEL M4 suppressor were removed, the weapon would have to be manually cycled after each single shot. On the other hand, the Mk 2 Mod 0 blast suppressor was considered an integral part of the Mk 4 Mod 0 rifle, but it would function normally if the suppressor were removed. The Mk 2 Mod 0 blast suppressor also drained water much more quickly and did not require any modification to the bolt carrier or to the charging handle. In the late 1970s, the Mk 2 Mod 0 blast suppressor was replaced by the Mk 2 blast suppressor made by Knight's Armament Company (KAC). The KAC suppressor can be fully submerged and water will drain out in less than eight seconds. It will operate without degradation even if the rifle is fired at the maximum rate of fire. The U.S. Army replaced the HEL M4 with the much simpler Studies in Operational Negation of Insurgency and Counter-Subversion (SIONICS) MAW-A1 noise and flash suppressor.
Developed to increase the effective range of soldiers in the designated marksman role, the U.S. Navy developed the Mk 12 Special Purpose Rifle (SPR). Configurations in service vary, but the core of the Mk 12 SPR is an 18" heavy barrel with muzzle brake and free float tube. This tube relieves pressure on the barrel caused by standard handguards and greatly increases the potential accuracy of the system. Also common are higher magnification optics ranging from the 6× power Trijicon ACOG to the Leupold Mark 4 Tactical rifle scopes. Firing Mk 262 Mod 0 ammunition with a 77gr Open tip Match bullet, the system has an official effective range of 600+ meters. However, published reports of confirmed kills beyond 800 m from Iraq and Afghanistan were not uncommon.
With the expanding Vietnam War, Colt developed two rifles of the M16 pattern for evaluation as possible light sniper or designated marksman rifles. The Colt Model 655 M16A1 Special High Profile was essentially a standard A1 rifle with a heavier barrel and a scope bracket that attached to the rifle's carry handle. The Colt Model 656 M16A1 Special Low Profile had a special upper receiver with no carrying handle. Instead, it had a low-profile iron sight adjustable for windage and a Weaver base for mounting a scope, a precursor to the Colt and Picatinny rails. It also had a hooded front iron sight in addition to the heavy barrel. Both rifles came standard with either a Leatherwood/Realist scope 3–9× Adjustable Ranging Telescope. Some of them were fitted with a Sionics noise and flash suppressor. Neither of these rifles were ever standardized.
Israel was supplied with large numbers of M16A1 rifles by the US Government, many of which were shortened to make them more suitable for urban combat, storage in vehicles, and policing use by shortening them. The 20-inch M16A1 barrel was pruned back to just behind the gas port, while a new gas port was drilled to accommodate a carbine-length gas system as the front sight base was pinned in place. The barrel was also threaded for a standard M16A1 birdcage flash suppressor and the resulting barrel was just shy of 13-inch overall, and a CAR-15 type collapsible buttstock was fitted to replaced the fixed M16A1 fixed buttstock, thus they approximate the size of CAR-15 type carbines. The informal term "Mekut'zrar" translates to "sawed-off" or "shorty".
The M16 is the most commonly manufactured 5.56×45mm rifle in the world. Currently, the M16 is in use by 15 NATO countries and more than 80 countries worldwide. Together, numerous companies in the United States, Canada, and China have produced more than 8,000,000 rifles of all variants. Approximately 90% are still in operation. The M16 replaced both the M14 rifle and M2 carbine as standard infantry rifle of the U.S. armed forces. Although, the M14 continues to see limited service, mostly in sniper, designated marksman, and ceremonial roles.
Defense Technical Information Center (DTIC) (1968), p. 5. - Defense Technical Information Center (DTIC) (1 June 1968). Report of the M16 Rifle Review Panel (PDF). Department of the Army. pp. 1–62. Archived (PDF) from the original on 12 February 2024. Retrieved 12 February 2024. https://apps.dtic.mil/sti/pdfs/ADA953111.pdf
Ezell et al. (1993), pp. 46–47; Urdang (1968), p. 801. - Ezell, Edward Clinton; Pegg, Thomas M.; Smith, Walter H.B. & Smith, Joseph E. (1993) [1983]. Small Arms of the World: A Basic Manual of Small Arms (12th ed.). Harrisburg, PA: Stackpole Books. pp. 46–47. ISBN 978-0-88029-601-4. OCLC 624461256. Retrieved 4 February 2022. https://archive.org/details/smallarmsofworld0000ezel/page/47/mode/1up?view=theater
Defense Technical Information Center (DTIC) (1968), p. 5. - Defense Technical Information Center (DTIC) (1 June 1968). Report of the M16 Rifle Review Panel (PDF). Department of the Army. pp. 1–62. Archived (PDF) from the original on 12 February 2024. Retrieved 12 February 2024. https://apps.dtic.mil/sti/pdfs/ADA953111.pdf
Osborne & Smith (1986), p. 1; Venola (2005), pp. 6–18. - Osborne, Arthur D. & Smith, Seward (February 1986). "ARI Research Note 86-19, ANALYSIS OF M16A2 RIFLE CHARACTERISTICS AND RECOMMENDED IMPROVEMENTS" (PDF). Mellonics Systems Development Division, Litton Systems, Inc. Fort Benning, GA: ARI Field Unit, Training Research Laboratory, United States Army – Research Institute for the Behavioral and Social Sciences. Archived from the original (PDF) on 29 March 2017. https://web.archive.org/web/20170329041706/http://www.dtic.mil/dtic/tr/fulltext/u2/a168577.pdf
Green & Stewart (2004), pp. 16–17. - Green, Michael & Stewart, Greg (2004). Weapons of the Modern Marines (pdf). Battle gear. St. Paul, MN: MBI Publishing Company. pp. 16–17. ISBN 978-0-7603-1697-9. LCCN 2003065746. OCLC 53231342. Retrieved 13 March 2020. https://archive.org/details/weaponsofmodernm0000gree/page/16/mode/2up?view=theater
Colt, M16 5.56mm Rifle (2003). - "M16 5.56mm Rifle". Colt.com. 2 June 2003. Archived from the original on 2 June 2003. Retrieved 8 October 2011. https://web.archive.org/web/20030602074644/http://www.colt.com/mil/M16.asp
Rottman (2011), p. 74. - Rottman, Gordon L. (20 December 2011). The M16. Weapon 14. Osprey Publishing. ISBN 978-1-84908-691-2. https://archive.org/details/m160000rott/
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Marine Corps Times, 26 October 2015, p.19. - Schehl, Matthew L. (26 October 2015). "Commandant approves M4 as standard weapon for Marine infantry". Marine Corps Times. Vol. 17, no. 22. Vienna, VA. p. 19.
South (2022), p. 1. - South, Todd (20 April 2022). "Army chooses Sig Sauer to build its Next Generation Squad Weapon". Army Times. p. 1. Archived from the original on 17 March 2023. Retrieved 6 May 2022. https://www.armytimes.com/news/your-army/2022/04/19/army-chooses-sig-sauer-to-build-its-next-generation-squad-weapon/
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Ehrhart (2009), pp. 12–16; Rottman (2011), p. 6. - Ehrhart, Thomas P. (30 November 2009). "Increasing Small Arms Lethality in Afghanistan: Taking Back the Infantry Half-Kilometer" (PDF). School of Advanced Military Studies. p. 1-76. Archived (PDF) from the original on 19 July 2013. https://apps.dtic.mil/sti/pdfs/ADA512331.pdf
Schreier (2001), p. 1. - Schreier, Philip (September 2001). "Cut down in its Youth, Arguably Americas Best Service Rifle, the M14 Never Had the Chance to Prove Itself" (PDF). NRA Museum. pp. 24–29, 46. Archived from the original (PDF) on 4 December 2013. Retrieved 3 June 2019. https://web.archive.org/web/20131204025725/http://www.nramuseum.com/media/940585/m14.pdf
Rottman (2011), p. 6. - Rottman, Gordon L. (20 December 2011). The M16. Weapon 14. Osprey Publishing. ISBN 978-1-84908-691-2. https://archive.org/details/m160000rott/
Thompson (2011), p. 35. - Thompson, Leroy (2011). The M1 Carbine. Weapon. Oxford, UK: Osprey (Bloomsbury Publishing). p. 35. ISBN 978-1-84908-907-4. OCLC 794243376. Archived from the original on 17 September 2023. Retrieved 8 February 2024. https://books.google.com/books?id=p1XDCwAAQBAJ
Canfield (2010), p. 1. - Canfield, Bruce N. (2 November 2010). "Arms of the Chosin Few". American Rifleman. Archived from the original on 5 December 2013. Retrieved 23 November 2011. http://www.americanrifleman.org/articles/arms-chosin-few/
Hall (1952), p. 593. - Hall, Donald L. (March 1952). "An Effectiveness Study of the Infantry Rifle" (PDF). Ballistic Research Laboratories. Aberdeen, MD: U.S. Army. p. 593. Archived from the original (PDF) on 24 September 2015. https://web.archive.org/web/20150924051902/http://www.dtic.mil/dtic/tr/fulltext/u2/377335.pdf
Pacific War Historical Society (2010). - "An Attempt To Explain Japanese War Crimes". Pacificwar.org.au. Archived from the original on 7 July 2012. Retrieved 23 August 2012. http://www.pacificwar.org.au/JapWarCrimes/Explaining_JapWarCrimes.html
Appleman (1992), p. 20; Godfrey (2003), pp. 44–49; Gropman (1997), p. 25; Hughes & Johnson (2005), p. 47. - Appleman, Roy Edgar (1992). South to the Naktong – North to the Yalu (June-November 1950) (PDF). Washington, D.C.: Center of Military History, United States Army. ISBN 978-0-16-035958-3. OCLC 28086548. Archived from the original (PDF) on 11 July 2022. Retrieved 8 February 2024. https://web.archive.org/web/20220711174702/https://history.army.mil/html/books/020/20-2/CMH_Pub_20-2.pdf
Harrison (1957), p. 15-17; Rose (2008), p. 4; Williams (2014), p. 1. - Harrison, E. H. (June 1957). "New Service Rifle" (PDF). Archived from the original (PDF) on 7 November 2015. https://web.archive.org/web/20151107045353/http://independencearmory.com/downloads/M14_Articles/American%20Rifleman%20-%20New%20Service%20Rifle_%20Amer.%20Rifleman%20June%2C%201957.pdf
Harrison (1957), p. 15-17. - Harrison, E. H. (June 1957). "New Service Rifle" (PDF). Archived from the original (PDF) on 7 November 2015. https://web.archive.org/web/20151107045353/http://independencearmory.com/downloads/M14_Articles/American%20Rifleman%20-%20New%20Service%20Rifle_%20Amer.%20Rifleman%20June%2C%201957.pdf
Pikula (1998), pp. 36, 38. - Pikula, Sam (1998). The ArmaLite AR-10 Rifle: The Saga of the First Modern Combat Rifle (kindle) (3rd (2016) ed.). Tucson, AZ: Regnum Fund. p. 15. ISBN 9789986494386. Archived from the original on 15 December 2022. Retrieved 23 May 2017. https://www.amazon.com/ArmaLite-AR-10-Rifle-Modern-Combat-ebook/dp/B0723C9CJ9
Pikula (1998), pp. 27–29. - Pikula, Sam (1998). The ArmaLite AR-10 Rifle: The Saga of the First Modern Combat Rifle (kindle) (3rd (2016) ed.). Tucson, AZ: Regnum Fund. p. 15. ISBN 9789986494386. Archived from the original on 15 December 2022. Retrieved 23 May 2017. https://www.amazon.com/ArmaLite-AR-10-Rifle-Modern-Combat-ebook/dp/B0723C9CJ9
Later changed to titanium.[39]
Pikula (1998), pp. 27–30. - Pikula, Sam (1998). The ArmaLite AR-10 Rifle: The Saga of the First Modern Combat Rifle (kindle) (3rd (2016) ed.). Tucson, AZ: Regnum Fund. p. 15. ISBN 9789986494386. Archived from the original on 15 December 2022. Retrieved 23 May 2017. https://www.amazon.com/ArmaLite-AR-10-Rifle-Modern-Combat-ebook/dp/B0723C9CJ9
Pikula (1998), pp. 36, 38. - Pikula, Sam (1998). The ArmaLite AR-10 Rifle: The Saga of the First Modern Combat Rifle (kindle) (3rd (2016) ed.). Tucson, AZ: Regnum Fund. p. 15. ISBN 9789986494386. Archived from the original on 15 December 2022. Retrieved 23 May 2017. https://www.amazon.com/ArmaLite-AR-10-Rifle-Modern-Combat-ebook/dp/B0723C9CJ9
Pikula (1998), pp. 36, 38". - Pikula, Sam (1998). The ArmaLite AR-10 Rifle: The Saga of the First Modern Combat Rifle (kindle) (3rd (2016) ed.). Tucson, AZ: Regnum Fund. p. 15. ISBN 9789986494386. Archived from the original on 15 December 2022. Retrieved 23 May 2017. https://www.amazon.com/ArmaLite-AR-10-Rifle-Modern-Combat-ebook/dp/B0723C9CJ9
Lewis (1962), p. 21; Pikula (1998), pp. 39–40. - Lewis, Jack (1962). "The M-14: Boon or Blunder". Gun World. 3 (4). Capistrano Beach, CA: Gallant Pub. Co. OCLC 60617000. https://search.worldcat.org/oclc/60617000
Harrison (1957), p. 15-17. - Harrison, E. H. (June 1957). "New Service Rifle" (PDF). Archived from the original (PDF) on 7 November 2015. https://web.archive.org/web/20151107045353/http://independencearmory.com/downloads/M14_Articles/American%20Rifleman%20-%20New%20Service%20Rifle_%20Amer.%20Rifleman%20June%2C%201957.pdf
Bruce (2002), pp. 20–27. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Per Jane's International Defense Review: "The M14 is basically an improved M1 with a modified gas system and detachable 20-round magazine."[44]
Harrison (1957), p. 15-17. - Harrison, E. H. (June 1957). "New Service Rifle" (PDF). Archived from the original (PDF) on 7 November 2015. https://web.archive.org/web/20151107045353/http://independencearmory.com/downloads/M14_Articles/American%20Rifleman%20-%20New%20Service%20Rifle_%20Amer.%20Rifleman%20June%2C%201957.pdf
Bruce (2002), pp. 20–27; Emerson (2006), p. 1. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Rottman (2011), p. 41. - Rottman, Gordon L. (20 December 2011). The M16. Weapon 14. Osprey Publishing. ISBN 978-1-84908-691-2. https://archive.org/details/m160000rott/
Godfrey (2003), pp. 44–49. - Godfrey, Frederick V. (2003). "The Logistics of Invasion" (PDF). Army Logistician. 35 (6). Army Logistics Management Command: 44–49. PB 700-03-6. Archived (PDF) from the original on 26 October 2016. Retrieved 23 November 2011. https://alu.army.mil/alog/2003/novdec03/pdf/nov_dec_alog.pdf
Ehrhart (2009), p. 16-19. - Ehrhart, Thomas P. (30 November 2009). "Increasing Small Arms Lethality in Afghanistan: Taking Back the Infantry Half-Kilometer" (PDF). School of Advanced Military Studies. p. 1-76. Archived (PDF) from the original on 19 July 2013. https://apps.dtic.mil/sti/pdfs/ADA512331.pdf
Hutton (1970), pp. 32–41. - Hutton, Robert, ed. (1970). "The .223". Guns & Ammo 1971 Annual. Los Angeles, CA: Petersen Publishing Company. pp. 32–41. OCLC 46748623. Archived from the original on 8 February 2024. Retrieved 8 February 2024. https://books.google.com/books?id=vU67GwAACAAJ
Ezell et al. (1993), pp. 46–47; Kern (2006), p. 10; Kokalis (2010), p. 1. - Ezell, Edward Clinton; Pegg, Thomas M.; Smith, Walter H.B. & Smith, Joseph E. (1993) [1983]. Small Arms of the World: A Basic Manual of Small Arms (12th ed.). Harrisburg, PA: Stackpole Books. pp. 46–47. ISBN 978-0-88029-601-4. OCLC 624461256. Retrieved 4 February 2022. https://archive.org/details/smallarmsofworld0000ezel/page/47/mode/1up?view=theater
Rottman (2011), p. 8. - Rottman, Gordon L. (20 December 2011). The M16. Weapon 14. Osprey Publishing. ISBN 978-1-84908-691-2. https://archive.org/details/m160000rott/
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
"The Contender: Winchester's .224 Light Rifle". American Rifleman. 19 February 2016. Retrieved 19 February 2016. https://www.americanrifleman.org/content/the-contender-winchester-s-224-light-rifle/
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Bruce (2002), pp. 20–27; Fallows (1981), pp. 56–65; Kern (2006), p. 10. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Fallows (1981), pp. 56–65. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Bruce (2002), pp. 20–27; Kern (2006), p. 10. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Fallows (1981), pp. 56–65; Morgan (1967), p. 4545. - Fallows, James (June 1981). "M-16: A Bureaucratic Horror Story" (PDF). The Atlantic Monthly. 247 (6). The Atlantic Monthly Group: 56–65. ISSN 1072-7825. OCLC 936540106. Archived (PDF) from the original on 22 February 2023. Retrieved 1 April 2019. https://cdn.theatlantic.com/media/archives/1981/06/247-6/132590966.pdf
Bruce (2002), pp. 20–27; Defense Technical Information Center (DTIC) (1968), p. 5; Kern (2006), p. 10; Kokalis (2010), p. 2. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Bruce (2002), pp. 20–27; Haas (2013), p. 67. - Bruce, Robert (April 2002). "M14 vs. M16 in Vietnam". Small Arms Review. 5 (7): 20–27. Archived from the original on 22 April 2016. Retrieved 3 June 2019. http://www.smallarmsreview.com/display.article.cfm?idarticles=2434
Per Haas: "Nicknamed a 'Mattel toy'[58] because of its small caliber and lightweight design, the M16 became the standard service rifle for U.S. forces in Vietnam in 1967. The weapon was much lighter compared to the M14 it replaced, ultimately allowing Soldiers to carry more ammunition. The air-cooled, gas-operated, magazine-fed assault rifle was made of steel, aluminum alloy and composite plastics, truly cutting-edge for the time. Designed with full and semi-automatic capabilities, the weapon initially did not respond well to wet and dirty conditions, sometimes even jamming in combat. After a few minor modifications, the weapon gained in popularity among troops on the battlefield. Still in service today, the M16 is being phased out by the M4 carbine.
Defense Technical Information Center (DTIC) (1968), p. 5; Kern (2006), p. 10. - Defense Technical Information Center (DTIC) (1 June 1968). Report of the M16 Rifle Review Panel (PDF). Department of the Army. pp. 1–62. Archived (PDF) from the original on 12 February 2024. Retrieved 12 February 2024. https://apps.dtic.mil/sti/pdfs/ADA953111.pdf
Arvidsson (2009), p. 8; Dougherty (2012), p. 26; Kern (2006), p. 10. - Arvidsson, Per G. (29 December 2009). "Weapons & Sensors" (PDF). NATO Army Armaments Group. pp. 1–20. Archived from the original (PDF) on 24 September 2015. https://web.archive.org/web/20150924131614/http://www.dtic.mil/ndia/2009infantrysmallarms/wednesdaysessionvArvidsson.pdf
Kern (2006), p. 10. - Kern, Danford Allan (2006). "The influence of organizational culture on the acquisition of the m16 rifle" (PDF). m-14parts.com. Fort Leavenworth, KS: US Army Command and General Staff College. Archived from the original (PDF) on 5 November 2013. https://web.archive.org/web/20131105215841/http://www.m-14parts.com/M14toM16.pdf
Kern (2006), p. 10. - Kern, Danford Allan (2006). "The influence of organizational culture on the acquisition of the m16 rifle" (PDF). m-14parts.com. Fort Leavenworth, KS: US Army Command and General Staff College. Archived from the original (PDF) on 5 November 2013. https://web.archive.org/web/20131105215841/http://www.m-14parts.com/M14toM16.pdf
Per Gourley: "Colt literature notes that the fourth generation of the M16 "still represents the world standard by which all other weapons of this class are judged. Its combat-proven performance is verified by the fact that over eight million M16 weapon systems have been produced and placed in military service throughout the world."[62] Per Valpolini: "Among western armies the M4 with its 356-mm-long barrel remains the benchmark type, although reports from the field have shown some criticism regarding its reliability in sand and dusty environments due to the direct impingement or 'gas-tube' system that tends to bring carbon blow-back into the chamber, while hot gases used to cycle the weapon generate heat problems."[63]
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This was dubbed the Ichord hearings after Missouri representative Richard Ichord, who championed Congress's inquiry into failures of the M-16 during the Vietnam War.[92]
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Per Taylor "From an accuracy standpoint, there is no comparison between the M16 and AK. As long as the upper and lower receivers are tight and the trigger is halfway decent, the M16 is capable of MOA accuracy, whereas a typical AK will produce 5 to 6 MOA at best. And, if a free-floated barrel is incorporated to the M16's design, it becomes capable of 1⁄2-MOA or better, making it fully as accurate as a finely tuned heavy-barreled bolt-action precision rifle."[136]
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The effective range of a firearm is the maximum distance at which a weapon may be expected to be accurate and achieve the desired effect.[139]
The horizontal range is the distance traveled by a bullet, fired from the rifle at a height of 1.6 meters and 0° elevation, until the bullet hits the ground.[140]
The lethal range is the maximum range of a small-arms projectile, while still maintaining the minimum energy required to put unprotected personnel out of action, which is generally believed to be 15 kilogram-meters (147 J / 108 ft.lbf).[141] This is the equivalent of the muzzle energy of a .22LR handgun.[142]
The maximum range of a small-arms projectile is attained at about 30° elevation. This maximum range is only of safety interest, not for combat firing.
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Taken from the long-range dispersion firing test of the AK-47 assault rifle, U.S. Army Foreign Science and Technology Center. August 1969. "Just how mediocre? Two decades later, the U.S. Army would hold long-range firing tests with Kalashnikov variants, including three Soviet, two Chinese, and a Romanian model. At 300 meters, expert shooters at prone or bench rest positions had difficulty putting ten consecutive rounds on target. The testers then had the weapons fired from a cradle by a machine, which removed human error. At 300 meters, the ten-rounds group fired in this manner had a minimum dispersion of 17.5 inches, compared to the 12.6 inches with an M-16, the American assault rifle fielded in Vietnam as a reaction to the Kalashnikov's spread.[145]
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Those who consider the M16 inhumane include; the International Committee of the Red Cross, Austria, Argentina, Belgium, Bolivia, Bulgaria, Burundi, Cambodia, Cyprus, Germany, Ireland, Latvia, Lithuania, Luxembourg, Mauritius, Mexico, Romania, Samoa, Slovenia, Sweden, Switzerland, etc.[108]
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