.223 Wylde chamber, mid-length gas system, 13.9 (p/w with Dead Air Silencer muzzle brake) or 16 in. barrel w/Horizon compensator, BD ZERO trigger, Quantum billet aluminum receiver set w/Presslock technology, linear compression pad, ambi charging handle, BD BCG, black anodized or Space Gray Cerakote finish, 6.62-6.84 lbs.