Product Description The Aero Precision AR-15 Bolt Carrier Group (BCG) in 5.56x45mm NATO is a complete, drop-in upgrade or build component engineered for reliability and longevity. Crafted from tough 8620 steel and finished with a durable black nitride coating, this BCG is designed to withstand the rigors of sustained fire while maintaining smooth cycling. Every detail has been carefully executed, from the properly staked gas key to the forward assist serrations, making this an ideal choice for AR-15 builders and enthusiasts who demand quality at every level. Product Highlights Premium 8620 Steel Construction: Built from industry-standard 8620 steel for outstanding durability and wear resistance under demanding conditions. Black Nitride Finish: The black nitride treatment provides superior corrosion resistance and a hard, slick surface that reduces friction for reliable cycling. Properly Staked Gas Key: The gas key is correctly staked per mil-spec standards, ensuring a secure, leak-free connection for consistent gas-operated function. Forward Assist Serrations: Machined forward assist serrations allow for reliable manual bolt closure when needed in the field. Black O-Ring Extractor Insert: Features a black O-ring insert on the extractor for enhanced extraction reliability and consistent ejection. Specs Brand: Aero Precision Model: AR-15 Bolt Carrier Group Caliber: 5.56x45mm NATO Material: 8620 Steel Finish: Black Nitride Fits: AR-15 Weight: 0.9 lbs MPN: APRH100615 UPC: 815421021219 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. ]]>