The TacFire AR-10 .308 / 7.62x51 Upper Receiver without Forward Assist is a complete upper receiver group designed to enhance any rifle build. The barrel features 4150 Chrome Moly Vanadium steel construction. This barrel also features a .750" gas block journal. The 1:10 twist ensures unmatched precision, while the 5/8x24-threaded barrel comes equipped with a factory-installed A2 flash hider. This complete upper receiver group features 7075-T6 aluminum construction and a corrosion-resistant hard-coat anodized finish for lasting durability.