ATF approved for use on almost all pistols. May require specific pistol adapters, depending on your application. (FDE) Flat Dark Earth, Blade Pistol Stabilizer with the KAK adjustable dimpled Buffer Tube (up to 1/5") and Castle Nut. Threads into any mil spec or commercial female buffer tube threads. Includes, (FDE) Flat Dark Earth Blade Stabilizer, buffer tube and castle nut only.**Out of stock**