Product Description The KAK Industry AR-15 bolt carrier group (BCG) is built for 5.56 NATO platforms using an M16-style (full-auto) carrier profile and a durable chrome finish for smooth cycling and easier cleanup. It features a 9310 steel bolt, a chrome cam pin, and a 4130 steel gas key, making it a dependable choice for building or refreshing a hard-use rifle. Product Highlights M16-style (full-auto) carrier profile bolt carrier group for AR-15 5.56 NATO rifles Full chrome (silver) finish for enhanced corrosion resistance and simplified maintenance 9310 steel bolt for strength and long-term reliability Chrome cam pin for reduced wear and smooth operation 4130 steel gas key for a robust, duty-ready BCG assembly Specs Brand: KAK Industry Product Type: Bolt Carrier Group (BCG) Platform: AR-15 Carrier Profile: M16 (full-auto) profile Caliber: 5.56 NATO / 5.56x45mm NATO Finish/Color: Chrome, Silver Bolt Material: 9310 steel Gas Key Material: 4130 steel Cam Pin: Chrome Manufacturer Part Number: 425-0505-001 UPC: 811163035064 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.