Short-stroke piston AR-15 pattern rifle with a 16.5-inch Nitride-treated barrel and matched upper/lower receivers machined from billet 7075 aluminum. Heat Dissipating System handguard manages piston heat. Premium American-made AR. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2015, USA Weight: 7.5 oz Overall length: 35" Status: Active Intended use: Patrol / Range / Competition