Product Description The Bootleg 5.56 Nitride Bolt Carrier Group (BCG) is a complete, MIL-SPEC configuration upgrade or replacement designed for dependable performance. Machined from 4140 steel and finished with a durable nitride coating, this carrier group is built for smooth cycling and long service life. It features a staked MIL-SPEC gas key and an M16-style carrier profile for proven functionality in standard AR-pattern 5.56 platforms. Product Highlights Durable nitride coating helps resist wear and corrosion for extended use Machined from 4140 steel for strength and reliability MIL-SPEC configuration for dependable fit and function Properly staked MIL-SPEC gas key supports consistent gas system performance M16-style carrier profile for robust, proven operation Specs Brand: Bootleg Product Type: Complete Bolt Carrier Group (BCG) Caliber: 5.56 Material: 4140 steel Finish: Nitride Configuration: MIL-SPEC Gas Key: Staked MIL-SPEC gas key Carrier Style: M16 style Manufacturer Part Number: BP-C15-BCG UPC: 864737000289 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.