a firearm that reloads itself and keeps firing until the trigger is released

a rapidly firing automatic gun (often mounted)

operating with minimal human intervention; independent of external control

any of the automatic rifles or semiautomatic rifles with large magazines designed for military use

a portable .30 caliber automatic rifle operated by gas pressure and fed by cartridges from a magazine; used by United States troops in World War I and in World War II and in the Korean War