Swiss Arms SA92 Stainless Steel CO2 BB Pistol Semi-auto Blowback Full-metal frame and slide Max. velocity: 314 FPS 21-round removable BB magazine Textured polymer grip panels Fixed front sight Fixed rear sight Under-muzzle accessory rail Uses one 12-gram CO2 cartridge (not included) Includes steel BBs, hex wrench, and CO2 cartridge cap* Overall length: 8.54" Weight: 2.5 lbs. Do not shoot steel BBs at hard objects * - The CO2 cartridge cap connects with the bottom of the CO2 cartridge (which is in the magazine) and is used to screw in the cartridge so it's properly pierced. The gun comes with 2 of these caps.