This steel AR-15, LR-308 receiver extension buffet tube nut-castle nut lock ring secures your buffer tube and end plate to your carbine lower receiver and is an important part of the carbine buffer tube stock assembly. This steel castle nut fits Mil-spec, Military, Commercial, and Hybrid buffer tubes on the AR-15, AR10 LR-308 carbine, and pistol. This steel castle nut is perfect for the AR series rifles for upgrading existing components or replacing worn or broken parts. This castle castle nut has a limited lifetime warranty and is made in the USA from solid steel with a matte black finish.
