The Faxon Firearms FF556BCGCNITRIDE is designed to enhance your AR-15 rifle\'s overall performance. The Faxon 5.56 M16 Bolt Carrier Group, Nitride is not only reliable but also designed for durability and long life. The nitride finish on the carrier and bolt enhances its resistance to corrosion, adding to its longevity.With a full-auto rated design, this bolt carrier group is fully compatible with M16-style rifles and other similar operating system firearms. You can trust its unmatched quality and excellent performance because all of our bolts go through a thorough MPI testing which verifies the absence of defects in the material.The bolt lugs have been chamfered at 45 degrees to ensure seamless action. This arrangement allows it to comfortably withstand the most intense pressure hand loads, as well as fast and lightweight actions. The Faxon Bolt Carrier Groups are full-Auto rated and continue to support the trip for full-auto fire control groups and multi-stage trigger systems.The gas keys use grade 8 fasteners and are fully staked, all to ensure that they provide you with the reliability you need for a lifetime. Each unit comes with a spring, insert, and \"Crane\" O-Ring already installed. Finally, the S7 Extractor concludes the list of features that make this product outstanding.