The Del-Ton Sierra 316H is a heavy-barrel AR-15 with a 16-inch HBAR profile barrel, suitable for extended range sessions where barrel heat management matters. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2012, USA Weight: 68 oz Overall length: 33.5" Status: Active Intended use: Precision, Tactical