AR-15 MBA-3/MBA-4 CARBINE CASTLE NUT Reviews & Ratings

FITS: The Luth-AR Carbine Lock Ring/Castle Nut for MBA-3 and MBA-4 Carbine Buffer Kits, as well as any Mil-Spec or Commercial Carbine receiver extension.

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Great quality for little $

For the price I decided to purchase this as an emergency backup part. But the quality was so nice I decided to use it on my build. It's a nice part for a very little investment

by CHARLES M. on January 10, 2024

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good value

looks to be well made. threads are slightly loose on mil-spec receiver extensions. Tried it on Aero, Bravo co. and Brownells extensions with same result. Works ok.