Smaller in length and height than the standard HK45, the HK45 Compact (HK45C) uses a slim-line grip profile, otherwise is nearly identical in features to the full-size HK45. Like the HK45, the HK45 Compact was developed as a possible candidate for the Joint Combat Pistol (JCP) and Combat Pistol (CP) programs administered by the U.S. military in their search for a new service handgun. These programs were suspended before completion and no pistols were selected. The HK45 Compact uses an HK proprietary O-ring barrel for precise barrel-to-slide lockup and optimal accuracy.

HK45 barrels are made using the famous HK cold-hammer forging process for superior performance. Using HK’s unique internal mechanical recoil reduction system reduces the recoil forces imparted to the weapon and shooter by as much as 30%, improving shooter control during rapid firing and increasing component service life. 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. The HK45 combines the accuracy, modularity, reliability, and minimum 20,000 round service life of the renowned USP45 Compact with the improved ergonomics of the P2000 series pistols.