The Guntec USA CASTLE-EXD-RPVD Extreme Duty Wide Castle Nut elevates your firearm's performance and visual appeal. Designed for performance-focused enthusiasts, this nut features a stunning Rainbow PVD coating that enhances both durability and aesthetics. Crafted from high-quality steel, this castle nut is engineered to withstand extreme conditions while ensuring compatibility with both mil-spec and commercial buffer tubes. Experience the perfect blend of reliability and style essential for every shooter. Made in the USA from high-quality steel Gen 3 design for enhanced reliability Compatible with mil-spec and commercial buffer tubes Unique Rainbow PVD coating for eye-catching aesthetics Superior corrosion resistance for lasting durability Secure fit prevents loosening during use Upgrade your firearm with the Guntec USA CASTLE-EXD-RPVD, where functionality meets style.