STI Duty One pistol Uses 12-gram CO2 cartridges 20-rd mag Slide moves in a realistic blowback action! Very realistic 1911 lookalike Fixed sights Manual safety Weaver accessory rail Includes gun, 5 Swiss Arms CO2 cartridges, ASG fake silencer and 1,500 Umarex steel BBs 1911-style BB gun incl. 1500 steel BBs, fake silencer and 5 CO2 cartridges 0.177 383