The Guntec USA CASTLE-HD Heavy Duty Wide Castle Nut elevates firearm stability with its superior design. Manufactured in the USA, this robust castle nut is compatible with both mil-spec and commercial buffer tubes, ensuring optimum performance and reliability. Durable construction from premium steel Wider configuration for enhanced grip Designed to minimize loosening during use Compatible with various buffer systems Ideal for serious shooters and firearm enthusiasts Enhance your shooting experience with the Guntec USA CASTLE-HD, where durability meets precision.