18B Weapons Characteristics Practice Test

The AK-74 operates as a gas-driven, selective-fire weapon. When a round fires, high-pressure gas is tapped from the barrel and feeds into a gas system that drives a long-stroke piston. This piston, in turn, cycles the bolt: unlocking, extracting the spent cartridge, ejecting it, chambering the next round, and resetting the hammer. This gas-operated action is what keeps the weapon cycling automatically as long as there’s ammunition and the sear is in auto or semi mode.

“Select fire” means the weapon can be fired in more than one mode, typically semi-automatic or fully automatic, depending on the selector. The mechanism itself is not direct impingement (where gas acts directly on the bolt carrier within the receiver) nor bolt-action (requiring manual cycling), nor recoil-operated (where barrel and bolt move due to recoil energy). That combination—the gas-driven piston system with selectable fire modes—fits the AK-74.