How does a gas operated weapon function?

A gas-operated weapon functions by utilizing the gases created from the combustion of the propellant in the cartridge. When a round is fired, a small amount of gas is diverted through a small hole, often referred to as a gas port, which connects the barrel to the gas system. This gas flows into a cylinder, where it exerts pressure on a piston or operating rod that is designed to move rearward. This rearward motion is what cycles the action of the weapon, ejecting the spent casing and chambering a new round for the next shot.

This mechanism is efficient and allows for rapid fire since the weapon automatically re-chambers after each discharge, leveraging the pressure generated by the gases. This contrasts with other methods of operating firearms, where the action may be manually cycled or operated through different mechanical systems, like the use of gears.

The other choices describe different operations that are not specific to gas-operated weapons, helping to clarify the unique functionality of this particular system.