A gas piston is a mechanical component commonly used in firearms and some engines. It operates by utilizing the pressure generated from gas produced during combustion or firing. This pressure pushes the piston, which then transfers energy to other parts of the system, enabling movement or operation. In firearms, the gas piston system helps reduce recoil and improve reliability by cycling the action more efficiently. This design is often found in semi-automatic and automatic rifles, where it contributes to faster firing rates and better accuracy. Overall, gas pistons enhance performance in various applications.