The M1903 Springfield, formally the United States Rifle, Caliber .30-06, Model 1903, is an American clip-loaded, 5-round magazine fed, bolt-action service rifle used primarily during the first half of the 20th century.It was officially adopted as a United States military bolt-action rifle on June 19, 1903, and saw service in World War I. It was officially replaced as the standard infantry rifle by the faster-firing semi-automatic 8-round M1 Garand starting in 1937.