Gas gun
A gas gun can be: A projectile-firing gun powered by compressed air: Air gun Airsoft gun A Less-lethal launcher, especially when loaded with CS gas grenades. A pneumatic cannon for projectile-firing test equipment such as a birdstrike simulator A gun that fires a stream of gas. This can be for these purposes among others:- The generate a loud noise as a bird scarer For propulsion in space: see Manned Maneuvering Unit#NASA "gas gun" Light gas gun, a velocity generating device used in physics experiments.
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