GunTec has a AR15 Extreme Duty Wide Castle Nut for Car/M4 Buffer Tube to provide more strength and durability for your AR. Made in the USA.

Specifications and Features:
GunTec AR15 Extreme Duty Wide Castle Nut for Car/M4 Buffer Tube
Gen 3 Newest Design
Enhanced Design for Extreme Strength and Durability
Steel
Fits Mil-spec/Commercial Buffer Tubes
US Made In Scottsdale, Arizona
Nitride Finish
Matte Black