The Guntec USA CASTLE-EXD-M-RPVD Extreme Duty Wide Castle Nut is designed for discerning firearm enthusiasts who demand both performance and visual appeal. Constructed from high-grade steel in the USA, this robust castle nut is built to endure the most challenging shooting environments, providing durability you can trust. Gen 3 design for enhanced strength and durability Compatible with both Mil-spec and commercial buffer tubes Unique matte rainbow PVD coating for wear and corrosion resistance Superior wide profile for secure buffer tube attachment Craftsmanship that unites form and function seamlessly Elevate your shooting experience with the Guntec USA CASTLE-EXD-M-RPVD - where performance meets style.