The Ruger American Pistol in .45 ACP with 4.5-inch barrel. Full-size .45 ACP variant of the American Pistol platform. Slightly longer barrel than the 9mm version accommodates the larger cartridge while maintaining the same grip ergonomics and interchangeable palm swells. Type: Semi-Auto Pistol Action: Striker-Fired Caliber: .45 ACP Capacity: 10 Year introduced: 2015, USA Weight: 30.9 oz Overall length: 7.75" Status: Active Intended use: Duty, Home Defense