Air gun is a pneumatic gun, which fires projectiles using compressed air or other high-pressure gas as a propellant. There are different methods of powering an air gun. These methods can be broadly divided into three groups such as spring-piston, gas ram and pneumatic. Spring-piston guns operate by means of a spring-loaded piston in a chamber separate from the barrel. Gas-ram rifles require higher precision to build, since they require a low friction sliding seal that can withstand the high pressures when cocked. Pneumatic type air guns require the pre-compression of air in a chamber prior to the gun being used. These air guns are used for hunting and military applications.
An air header is used to replace many valve assemblies, which is normally operated from one source. It consists of up to ten outlet-isolating valves with one distribution pipe. It is generally made of stainless steel.