The DUTY ONE non-blowback CO2 pistol is fully licensed by the famous small arms manufacturer STI International. The DUTY ONE is based on the famous 1911 but has been upgraded and many of the functions have been re-designed. The most noticable change from the standard 1911 is the tactical rail that is built into the frame of the gun. This rail allows the user to add an accessory such as a laser or a flashlight. The grips are engraved with the STI logo and the extended beaver tail ensures a secure grip on the pistol. A small indentation has also been added to the grip allowing easier thumb access to the magazine release button. The magazine capacity is 16 rounds. The 12g CO2 cartridge is stored inside the handle, not the magazine. This allows the shooter to fire multiple magazines without having a co2 cartridge installed in each one. This gun is quite powerful, shooting at an impressive 436 FPS with 0.20g BBs.