Caliber: 5.56mm NATO. Capacity: 30 rounds. Barrel: 16”, standard government profile, 1:7” twist, M4 feed ramp barrel extension. USGI chrome-lined bore and chamber. Mil-Spec 11595E barrel steel, manganese phosphate finish. Stock: BCM Gunfighter. Sights: Flat-top rail, post front. Weight: 6.3 lbs. Overall Length: 32.5” to 35.5”. MOD 2 has BCM QRF Handguard. 6.5 lbs.