Legends M712 pistol Uses a 12-gram CO2 cartridge Full-/semi-auto Blowback* 18rd removable BB magazine Manual safety Fixed front sight Elevation-adjustable rear sight Plastic grips Single-action Full metal *The blowback on the M712 CO2 pistol functions the same as it does on the firearm. There's no slide. The only thing that moves is the bolt. The purpose of the bolt's movement is to cock the hammer (because this is a single-action pistol).