The Guntec USA CASTLE-EXD-BC Extreme Duty Wide Castle Nut for Buffer Tube is an essential upgrade for firearm enthusiasts seeking top performance. Crafted from high-quality steel in the USA, this durable castle nut supports AR-style rifles with remarkable strength and reliability. Its black chrome finish enhances resistance to corrosion, ensuring long-lasting wear. Extreme duty design for enhanced durability Compatible with mil-spec and commercial buffer tubes Easy installation for secure attachment Advanced engineering for modern shooters Corrosion-resistant black chrome finish Transform your shooting experience with the Guntec USA Extreme Duty Wide Castle Nut.