The HK45 full size and HK45C Compact were developed to meet the needs of U.S. military operators. This full size V1 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. An improved USP style control lever, a combination safety and decocking lever, is frame-mounted on the HK45 and is quickly accessible. The HK45 control lever has a positive stop and returns to the fire position after decocking. An integral Picatinny rail is molded into the polymer frame dust cover for mounting lights, laser aimers, and other accessories. The HK45's ergonomic grip profile includes replaceable grip panels to adjust the feel and grip circumference of the weapon to suit individual operator hand size and shooting preference. Polygonal rifling for longer barrel life and better accuracy. Low profile, drift-adjustable 3-dot sights.