The HK45 is a full-size .45 ACP pistol developed from the USP45, featuring HK LEM trigger system options, Picatinny rail, and the ambidextrous controls that define the HK pistol lineup. Type: Pistol Action: Short-Recoil Caliber: .45 ACP Capacity: 10 Year introduced: 2007, Germany Weight: 29.6 oz Overall length: 7.8" Status: Active Military use: Yes Intended use: Home Defense, Tactical, Service