This steel AR-15 castle nut is virtually indestructible and works with commercial, military, and hybrid buffer tubes. It fits most AR-15s and AR variants, but it is not compatible with 308 rifles. This AR-15 castle nut is made by ATI in the U.S.A.
Brand: Advanced Technology
Department: Firearm Parts » AR-15 » Castle Nut
Advanced Technology Firearm Parts AR-15 Castle Nut Steel Black [A5101020]
Application: Gun Part