Gen4 G21 evaluated by US Special Operations Command for potential adoption. SOCOM evaluation involved the G21 as a full-size .45 ACP option. Standard Gen4 G21 features with SOCOM evaluation history. Type: Semi-Auto Pistol Action: Striker-Fired Caliber: 45 ACP Capacity: 13 Year introduced: 2014, Austria Weight: 29.28 oz Overall length: 7.59" Status: Active Military use: Yes Intended use: Military, Service