A gas-operated rifle is a type of firearm that uses the pressure generated by the expanding gases of a fired cartridge to cycle the action of the rifle. In other words, the gases from the combustion of the gunpowder propel the bullet down the barrel and through the muzzle, and some of these gases are captured and used to operate the action of the rifle.

The gas-operated system works by directing some of the gases from the fired cartridge into a gas cylinder, which is attached to the barrel. A piston, which is connected to the bolt of the rifle, is then pushed back by the pressure of the gases, causing the bolt to unlock and move to the rear. This movement extracts the spent cartridge casing from the chamber and compresses a spring, which then pushes the bolt forward to chamber a new cartridge from the magazine.
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