BCM BCM4 complete rifle with 16-inch barrel, BCM upper and lower receivers, Gunfighter stock and grip. Complete mil-spec duty rifle. Type: Rifle Action: Semi-automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2010, USA Weight: 63.5 oz Overall length: 32.5" Status: Active Intended use: Duty/Home Defense