The G41 Gen4 MOS is the long-slide .45 ACP competition Glock, featuring a 5.31-inch barrel, MOS optics capability, and slimmed frame compared to the G21 for competition and duty use. Type: Semi-Auto Pistol Action: Striker-Fired Caliber: .45 ACP Capacity: 13 Year introduced: 2014, Austria/USA Weight: 27.05 oz Overall length: 8.9" Status: Active Intended use: Competition, Duty