The HK45 Compact Tactical uses a slim-line grip profile, otherwise is nearly identical in features to the full-size HK45. The HK45 Compact uses an HK proprietary O-ring barrel for precise barrel-to-slide lockup and optimal accuracy. Capable of firing standard .45 ACP ball through +P ammunition. The HK45CT comes standard with a threaded barrel, 10rd magazine with extended floorplate. The HK45 Compact Tactical is currently available as a conventional double action/single action pistol. The V7 model that uses HKs enhanced double action only trigger mechanism and has no external safety/decking lever. Includes an extra backstrap for a custom fit for each shooter's hand and two 10rd magazines.