Spare green gas magazine for the fully licensed B&T USW blowback pistol . Holds 24 rounds and is powered by green gas. The magazine is backwards compatible with all our other metal-frame full blowback CZ airsoft pistols (CZ 75, CZ SP-01 Shadow, CZ ACCU Shadow, CZ Shadow 2). Tested with and performs best with Ultrair Power Gas from ActionSportGames.