Product DescriptionThe CMC Triggers Enhanced Bolt Carrier Group is a complete AR-15 bolt carrier group engineered to improve fatigue strength, increase wear resistance, and deliver exceptional lubricity with a low friction coefficient. Finished in black nitride for enhanced cosmetic appeal and corrosion resistance (ASTM B117), it is designed for smooth function and easier maintenance in demanding use. Compatible with mil-spec AR-15 uppers chambered in .223 Remington, 5.56x45mm NATO, and .300 Blackout.Product Highlights Enhanced black nitride bolt carrier group built for reduced friction and reliable cycling in AR-15 platforms Corrosion-resistant finish designed to withstand ASTM B117 salt-spray testing for long-lasting protection Compatible with .223 Remington, 5.56 NATO, and .300 Blackout mil-spec AR-15 upper receivers Precision-focused construction intended to improve wear resistance and overall service life Complete bolt carrier group assembly suitable for suppressed and high-volume shooting applicationsSpecs Brand: CMC Triggers Product Type: Enhanced Bolt Carrier Group (Complete) Platform/Fit: AR-15 (mil-spec compatible upper receivers) Compatible Calibers: .223 Remington; 5.56x45mm NATO; .300 Blackout Material: 8620 steel Finish/Color: Black Nitride / Black Manufacturer Part Number: 81631 UPC: 810943030961 Approx. Weight: 0.8 lbDisclaimer: 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.