Product DescriptionThe Armaspec Carbine Buffer Tube Kit is a mil-spec receiver extension kit designed for AR-platform builds and upgrades. Built from strong 7075-T6 aluminum and made to mil-spec dimensions, this 6-position carbine tube delivers reliable fitment and adjustable length of pull for compatible collapsible stocks. The kit includes the essential mounting hardwarea castle nut and mil-spec end platefor a secure, complete installation.Product Highlights Mil-spec dimensioned carbine buffer tube for broad AR compatibility 7075-T6 aluminum construction for enhanced strength and durability 6-position receiver extension for adjustable stock positioning Includes castle nut and mil-spec end plate for a complete install Black finish for a clean, factory-style lookSpecs Brand: Armaspec Product Type: Carbine buffer tube kit (receiver extension kit) Material: 7075-T6 aluminum Dimensions: Mil-spec Positions: 6 Included Components: Buffer tube, end plate, castle nut Color/Finish: Black Country of Origin: USA Manufacturer Part Number: ARM621-C UPC: 810048492916Disclaimer: 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 products manufacturer.