The B.A.R. or Browning Automatic Rifle was 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).
(Easy to change the spring and spring guide for just pull the quick takedown pin on the top of gearbox)