The M1903 Springfield, officially the U.S. Rifle, Caliber .30, M1903, is an American five-round, magazine-fed, bolt-action, repeating service rifle, used primarily during the first half of the 20th century.
Primarily chambered for .30-06 Springfield, it was also available in .30-03 Springfield to match the .303 caliber round of the British standard service rifle, the Lee-Enfield.
The M1903 was first used in combat during the Philippine-American War and was officially adopted by the United States as the standard infantry rifle on 19 June 1903. It saw service in World War I and was replaced by the faster-firing semi-automatic eight-round M1 Garand starting in 1936. However, the M1903 remained a standard-issue infantry rifle during World War II, since the U.S. entered the war without sufficient M1 rifles to arm all troops. It also was used as a sniper rifle during World War II, the Korean War and the Vietnam War. It remains popular as a civilian firearm, collector's piece, a competitive shooting rifle and as a military drill rifle.