The STI Duty One 1911 Non-Blowback Airsoft Pistol is a full size replica of the actual STI Duty one 1911 pistol which is a modernized and upgraded version of the original classic Colt 1911. You will find features like; an integrated weaver rail for lasers and tactical lights, high rise beavertail grips, a unique serial number on each air pistol and STI licensed markings.