Browning Gun

The Maxim Gun was the first self-powered machine gun, invented by the American-born,  British inventor Sir Hiram Maxim in 1884. The mechanism of the Maxim gun used the energy from the recoil force to eject each spent cartridge and insert the next one. This made it vastly more efficient and less manpower-demanding than previous machine guns, like the Gatling Gun which were built on an entirely different principle, using crank handles and a multibarreled approach. Trials showed that the Maxim could fire 600 rounds per minute.