The M1, designed by John C. Garand, was the standard issue military rifle used by the U.S. Army from 1936 to 1957, when it was replaced by the lighter M14 rifle. The M1 was one of the first semi-automatic rifles to see action in combat. It offered a great improvement in fire power over the bolt-action M1903 series rifle it replaced. It was rugged, reliable, and tolerant to the abuses of use in the field. The rifle used .30-06 cal. cartridges in eight-round clips.The M1C and M1D were sniper versions of the M1 Garand. The two models differed only in the telescope mounts. The M1C mounted a model M81 2.5X telescope; the M1D an M82 2.5X telescope. Both models were used as sniper rifles during World War II, Korea, and during the early years of the Vietnam war. Although considered obsolete, the M1D remained the official U.S. Army sniper rifle until the mid-1960s. Both versions used the standard Army .30-06 cartridge loaded manually, or in eight-round clips.
