Rat Dog 9mm BCG Durability and Toughness: The Rat Dog 9mm BCG is built from tough 8620 steel in a single-piece design. This PCC Bolt Carrier Group is built to last. Its robust construction ensures it can handle the rigors of frequent use without compromising on durability. It is heat-treated to enhance its strength and resilience, this PCC Bolt Carrier Group is ready to take on any challenge you throw its way. Long-lasting Finish: With an ArmorLube Advanced DLC finish, this PCC Bolt Carrier Group offers unparalleled corrosion resistance and longevity. Say goodbye to worrying about rust or wear and tear-this bolt is built to withstand the elements and keep on performing. Versatile Compatibility: Designed for compatibility with a wide range of AR15-style PCC systems, including those using Glock-style magazines, Colt-style magazines, and the innovative Endomag system, this PCC Bolt Carrier Group is as versatile as it is reliable. Plus, it's fully compatible with full-auto setups, ensuring smooth cycling even under rapid fire conditions. Proudly American-made: This PCC Bolt Carrier Group is proudly made in America, so you can trust in its quality and craftsmanship. Whether you're building a new AR9 from scratch or upgrading an existing setup, the 9mm AR9 BCG is the perfect choice for those who demand nothing but the best. Final words: Experience the difference for yourself-get your hands on the 9mm AR9 BCG and take your pistol-caliber carbine build to the next level. With its unbeatable combination of durability, reliability, and compatibility, it's the bolt you can count on when it matters most.