The AR-15A2 HBAR (Heavy Barrel) is Colt's civilian equivalent of the military M16A2 configuration with a 20-inch heavy-profile barrel and fixed A2 stock. The HBAR designation indicates a thicker barrel profile for sustained fire and improved accuracy. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 1986, USA Weight: 8.5 oz Overall length: 39.5" Status: Active Intended use: Range, Precision, Hunting