The FailZero EXO AR9 Bolt Carrier Group in Nickel Boron is engineered for reliable 9mm AR platforms, arriving fully assembled and ready to drop into most 9mm AR rifles and pistols. This BCG is compatible with both Glock and Colt magazine configurations, offering versatile use across popular builds. All critical components are coated with EXO Nickel Boron technology, delivering permanent dry lubricity along with exceptional durability that enhances wear and corrosion resistance, while reducing friction to improve overall performance and smooth cycling. The 8620 heat-treated carrier aligns with Mil-Spec standards for dependable strength, and the staked gas key ensures secure gas management in demanding shooting conditions. A 5.56 extractor and a chrome firing pin further contribute to reliable chambering and ignition, making this bolt carrier group a robust choice for precision, reliability, and long-term field use. Ideal for enthusiasts constructing or upgrading a 9mm AR system, the FailZero EXO AR9 BCG combines advanced coating science with proven performance to deliver consistent reliability and easy maintenance under varied shooting scenarios.