Gas-powered airsoft guns are capable of both semi-automatic and automatic firing. They are primarily powered by either “green gas” (HFC-134a) or propane (adaptor required), but some also run on the less common “red gas,” nitrogen, high-pressure air and CO2. It should be noted that the so-called red gas is actually HCFC-22, which is illegal for use in the United States due to its ozone-depleting nature.
As you can see from our selection, gas power is most commonly put to use in airsoft pistols. The reason behind this is that their small size makes it rather impractical to jam a bunch of electrical equipment in there. That being said, certainly you will find some sniper rifles, assault rifles and SMGs that run on this tech. Additionally, gas is used as a power source for airsoft weapons when adjustable velocities are necessary or when a blowback feature is wanted. What the heck is that? Well, it’s basically just a device that cycles a bolt or spring in an attempt to better simulate a real-life firearm’s feel. Most airsoft sniper rifles deliberately exclude a blowback feature in order to achieve an increase in muzzle velocity and/or lower recoil for higher levels of accuracy.
In addition to airsoft guns, gas is also utilized in both tossed and projectile grenades. The latter of which is launched from a, well, launcher. Their shells operate under a system that involves a gas-filled internal piston. On the top of said shell, you’ll find either a soft/rubber head or some pellets. Once the pressure releases, things go boom.