The HK45 full size and HK45C Compact were developed to meet the needs of U.S. military operators. Smaller in length and height that the standard HK45, the HK45 Compact uses a slim line grip profile, otherwise is nearly identical in features to the full size HK45. Capable of firing standard .45 ACP ball through +P ammunition, the HK45 Compact has an 8 round magazine capacity but can also use 10 round magazines, including those designed for the full size HK45. An integral Picatinny rail is molded into the polymer frame dust cover for mounting lights, laser aimers, and other accessories. The HK45 also features ambidextrous controls with dual slide releases and an enlarged magazine release. An o-ring barrel provides precise barrel to slide lockup and better accuracy. Polygonal rifling for longer barrel life and better accuracy. Low profile, drift-adjustable 3-dot sights.