To function the gun, you turn a crank, which revolves the barrels In the cylinder. Each and every barrel passes under an ammunition hopper, or carousel magazine, because it reaches the highest on the cylinder. A brand new cartridge falls to the breech as well as the barrel is loaded. https://machguns.com/product/lot-1448-dlo-1919a4-browning-class-iii-nfa-fully-transferable/