The HK45 OR adds a factory optics-ready slide cut to the standard HK45, allowing direct mounting of miniature red-dot sights without adapter plates. It retains the full HK45 ergonomic package with Picatinny rail and interchangeable grip panels. Type: Semi-Auto Pistol Action: DA/SA Caliber: .45 ACP Capacity: 10 Year introduced: 2018, Germany Weight: 31.2 oz Overall length: 7.91" Status: Active Intended use: Duty, Optics Platform, Home Defense