Barrel: 12.5" 416R Nitride Finish Chambered in .308, with a 1:10 twist, and a mid-length gas system. Barrel is finished off with a Rifle Speed Adjustable Gas Block, 10.5" QDSM Rail, and a Sabre Compensator muzzle device.Upper: Forged 7075-T6 A3 AR upper. These uppers are T-Marked engraved.Bolt Carrier Group: Sabre AR-10 BCG with Sprinco Gas Rings and OCK's Gas Key FastenersLower: Sabre-10 lower with SB Tactical SBA5 Brace and Sabre grip. Marked multi-caliber. Comes Standard with PSA AR-10 Rifle Buffer Spring, Sabre 9 Position S5 Buffer tube, Sabre 2-Stage DLC Trigger, and Anti-Walk Pins.