The .45 ACP variant of the USP was the primary design target when HK developed the platform. Larger frame than the 9mm version, with a recoil buffer built into the guide rod assembly to reduce felt recoil. Type: Semi-Auto Pistol Action: Double-Action/Single-Action Caliber: .45 ACP Capacity: 12 Year introduced: 1995, Germany Weight: 30 oz Overall length: 7.87" Status: Active Military use: Yes Intended use: duty, service