An air gun or air gun, is a gun that fires projectiles pneumatically with compressed air or other gases that are mechanically pressurized without involving any chemical reactions, in contrast to a firearm, which pressurizes gases chemically via oxidation of combustible propellants that generates propulsive energy by molecular bond. Pump air guns are designed with a lever that acts as an air pump for the gun. In order to fire it, the user must pump the lever to pressurize the internal reservoir. Once the pressure is built, pulling the trigger releases this pressure and propels the pellet forward out of the barrel.
