Product Description The LBE Unlimited AR15BLT AR-15 Complete Bolt Carrier Group (BCG) comes assembled and ready to install, making it a dependable upgrade or replacement for your AR-15 upper. Built around a phosphated (black phosphate) 8620 steel carrier and paired with a Carpenter 158 bolt, this complete BCG features a chrome-lined carrier interior and chrome-lined gas key to support smooth operation and easier cleaning. A properly staked gas key helps maintain fastener security under hard use. Product Highlights Complete, assembled AR-15 bolt carrier group for straightforward drop-in installation Phosphated (black phosphate) 8620 steel carrier for corrosion resistance and durability Carpenter 158 bolt with extractor and bolt gas rings included Chrome-lined carrier interior and chrome-lined gas key for smoother cycling and easier maintenance Staked gas key screws designed to help retain gas key alignment under recoil and heat Specs Product Type: Complete Bolt Carrier Group (BCG) Platform Compatibility: AR-15 Carrier Material: 8620 Steel Finish: Black Phosphate / Phosphated Bolt Material: Carpenter 158 Carrier Interior: Chrome-lined Gas Key: Chrome-lined; screws staked Included Components: Extractor; bolt gas rings Country of Manufacture: USA UPC: 765857617268 Manufacturer Part Number: AR15BLT Brand: LBE UNLIMITED 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.