The FailZero FZ 9mm Black Nitride AR9 Bolt Carrier Group is a fully assembled, drop-in solution designed for most 9mm AR platform rifles and pistols, engineered to deliver reliable cycling and enhanced durability. This AR9 BCG is compatible with lowers designated for Glock or Colt magazines, broadening your ammunition and magazine compatibility without compromise. All critical parts are coated with Salt Bath Nitride in black, delivering improved wear and corrosion resistance for demanding environments and prolonged service life. The carrier is 8620 heat treated, matching Mil-Spec strength, with a staked carrier guide gas key to ensure consistent performance under varied firing conditions. A 5.56 extractor and a chrome firing pin further enhance reliability, ensuring smooth extraction and positive ignition across a range of 9mm cases and loads. Ideal for precision target shooting, home defense, or tactical practice, this BCG delivers a clean, low-friction surface and durable construction that helps maximize reliability when paired with compatible 9mm uppers and lower receivers.