The WMD Mil-Spec Carbine Buffer Tube is precision-machined from 7075 aluminum and features a durable NiB-X nickel boron coating for enhanced performance and longevity.WMD Mil-Spec Carbine Buffer Tube7075 aluminum construction for lightweight strengthNiB-X nickel boron coating for corrosion resistanceAccepts M4-style adjustable carbine buttstockSix-position adjustment capabilityMil-spec receiver extension tube designIdeal for AR-15 builds and upgrades this buffer tube provides reliable mil-spec compatibility with enhanced durability from its premium materials and advanced coating technology.