Dawson Precision Tactical Advantage Spec Ops 2011 built on an STI frame and slide, custom hand-fitted DP .400 bull barrel chambered in .40 S&W, genuine BO-MAR adjustable target rear sight with black dovetail front sight, Extreme Engineering fire control parts including the hammer, sear, and disconnect, hand fit and blended grip safety with narrowed rear for larger hands and easier access to the controls, STI Recoilmaster (invented by Dawson), STI aluminum magwell, ambidextrous thumb safety, and more. This pistol has an impeccable light and crisp trigger pull, and cycles so smooth and flat. It is an important part of race gun history and would also well serve anyone wishing to shoot Limited division in USPSA or Standard diviison in IPSC, or just shoot it for the sheer enjoyment of it. It does not ship with a magazine, but will use any STI, SV, Infinity, Staccato, MBX, Atlas, etc. 2011 magazine in .40S&W/10mm.