Aero Precision's mil-spec carbine receiver extension is machined from 7075-T6 aluminum for rock-solid strength in a lightweight package. This 6-position, black anodized buffer tube ships ready to install and weighs just 3.1 oz, making it an ideal choice for AR-15 builds that demand MIL-SPEC fit, dependable durability, and a clean finish.Key Features Mil-spec dimensions, machined from 7075-T6 aluminum. 6-position adjustment for adjustable stocks. Anodized black finish; lightweight at ~3.1 oz. Made in the USA and built to standard AR-15 specs.Please note: This product may arrive in a plain box or polybag due to manufacturer bulk packaging.