Advanced Technologies AR-15 Castle Nut Steel Black A.5.10.1020

Advanced Technology
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On a modern sporting rifle, the castle nut is used to lock the buffer extension tube to the receiver. Virtually indestructible, this castle nut is made of steel in the USA by Advanced Technologies. It is designed to work Commercial, Mil-Spec and Hybrid buffer tubes. It fits most standard AR-15 and AR variant rifles. NOTE: not compatible with .308 rifles.