Editing Air gun (section)

==== CO<sub>2</sub> ====
[[File:Walther CP88 Schall.jpg|thumb|[[Walther CP 88]] CO<sub>2</sub> pistol with adapted silencer]]
[[File:Crossman-2240.jpg|thumb|Crosman 2240 CO<sub>2</sub> one shot pistol, (.22 pellet caliber)]]
'''CO<sub>2</sub> guns''', like other pneumatic guns using compressed air, offer power for repeated shots in a compact package without the need for complex pumping or filling mechanisms. The ability to store power for repeated shots also means that repeating arms are possible. There are many replica revolvers and semi-automatic pistols on the market that use CO<sub>2</sub> power.  Most CO<sub>2</sub> guns use a disposable cylinder called a "[[Powerlet]]" cartridge, that is often purchased with {{convert|12|g|oz}} of pressurized CO<sub>2</sub> gas, although some, usually more expensive models, use larger refillable CO<sub>2</sub> reservoirs like those typically used with [[paintball marker]]s.

CO<sub>2</sub> guns are popular for training, as the guns and ammunition are inexpensive, relatively safe to use, and no specialized facilities are needed for safety. In addition, they can be purchased and owned in areas where firearms possession is either strictly controlled or banned outright. Most CO<sub>2</sub> powered guns are relatively inexpensive, and there are a few precision target guns available that use CO<sub>2</sub>.