Tanfoglio Witness 1911 CO2 BB Pistol Replica 1911 Uses 12-gram CO2 cartridges Semi-auto 18rd removable BB magazine (also holds the CO2 cartridge) Fixed front and rear sights Blowback Last round hold open Metal construction Checkered grips Single-action only Manual safety Functional grip safety The box states that this gun comes with Hop-Up (spin), but it does not. The owner's manual states that this gun is double-action and single-action. That is incorrect. It is single-action only.