The 45 ACP HK45 includes several user-inspired enhancements including changeable grip backstraps; Picatinny MIL-STD-1913 accessory rail; better ergonomics; O-ring barrel for precise barrel-to-slide lockup and optimal accuracy and cold-hammer forging process for superior performance; threaded barrel; 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. Includes an extra backstrap and two magazines.