The BCM4 represents the core line of professional-grade, hard-use AR-15 lower receivers and complete rifles manufactured by Bravo Company Manufacturing (BCM). Revered by military, law enforcement, and civilian shooters alike, BCM4 components are widely considered an industry benchmark for duty-ready reliability, strict quality control, and adherence to Mil-Spec (and often exceeding Mil-Spec) tolerances. VERY GOOD CONDITION SOFT CARRY CASE ONE 30-ROUND MAGAZINE Caliber: 5.56x45mm NATO / .223 Remington Capacity: 30+1 rounds (Standard AR-15 magazine) Barrel Length: 16.0 inches (Milspec small arms barrel steel, chrome lined) Barrel Twist Rate: 1:7 Right Hand Muzzle Thread: 1/2"x28 TPI (Ships with a BCMGUNFIGHTER Mod 0 Compensator) Gas System: Mid-Length Receiver Material: Forged 7075-T6 aluminum (Upper and Lower) Finish: Type III Class 2 Hardcoat Anodizing Overall Length: 32.5 inches (Stock collapsed) to 35.75 inches (Stock extended) Weight: 6.2 lbs (Approximate unloaded weight, depending on handguard choice) Trigger: BCM PNT (Polished Nickel Teflon) single-stage trigger