Carbine, a lightweight rifle with a short barrel. Early models were designed for use by cavalry, but in modern armies carbines are used mostly for self-protection by troops whose principal duty is not infantry fighting. Because of its size and weight, the weapon is also sometimes used by paratroops.
A carbine is more accurate than a pistol, but has a shorter effective range and less striking power than the standard rifle. U.S. Army carbines in World War II and the Korean War fired .30 caliber ammunition. There were both semiautomatic and automatic models.