Browning automatic rifle (BAR), automatic rifle produced in the United States starting in 1918 and widely used in other countries as a light machine gun. The BAR is a gas-operated rifle invented by John M. Browning (1855–1926), an American gun designer. It has been chambered for various ammunition, but most frequently for .30-06 Springfield. About 47 inches (120 cm) long, it has a 20-round magazine and weighs 19.4 pounds (8.8 kg). It can fire up to 650 rounds per minute but can also fire single shots or bursts of two or three to increase accuracy. It can be fired from the shoulder or mounted on a bipod.