Barrel: 18" 416R. Chambered in .308, with a 1:10 twist, and a mid-length gas system. Barrel is finished off with a 15" Knurled Slant Rail, and a Sabre Compensator muzzle device. Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. These uppers are T-Marked engraved. Bolt Carrier Group: Sabre AR-10 BCG with Sprinco Gas Rings, Sprinco Ejector Spring, Sprinco Extractor Spring, and OCK's Gas Key Fasteners Lower: Sabre-10 lower with black Magpul SL-S stock and grip. black cerakote finish. Marked multi-caliber. Comes Standard with PSA Buffer Spring, Sabre 2-Stage DLC Trigger, and Anti-Walk Pins.