- Air Gun
Not a firearm but a gun that uses compressed air or CO2 to propel a projectile. Examples: BB gun, pellet gun, CO2 gun. An air gun or airgun (also called pellet gun or rarely a gas gun) is any one of a variety of guns that propel projectiles by means of compressed air or other gas, in contrast to firearms which use a propellant charge. Both the rifle and pistol forms (air rifle and air pistol) normally fire metallic projectiles, either pellets or spherical balls based on the BB size of birdshot - although a few fire darts.