Glock 21 Gen4 with RTF4 grip texture and reversible magazine release. The Gen4 grip is modular, improving fit for shooters who found the Gen3 too wide. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 13 Year introduced: 2010, Austria Weight: 26.28 oz Overall length: 7.59" Status: Active Intended use: Service, Duty, Home Defense, service, defense