Knights Armament SR-15 E3 Carbine with 14.5-inch barrel. URX 4 M-LOK handguard. Pinned and welded KAC QDC flash suppressor to legal length. Compact duty configuration. Type: Rifle Action: Semi-Auto Caliber: 5.56 NATO Capacity: 30 Year introduced: 2013, USA Weight: 62 oz Overall length: 31.5" Status: Active Intended use: Duty, Defense, Patrol