The Fortis Standard Castle Nut is manufactured from a solid piece of billet aircraft grade aluminum that offers a significant weight reduction to your castle nut. If you're trying to save ounces, this is a great way, but without sacrificing durability. The castle nut will fit onto mil-spec buffer tubes and quickly upgrade the form and function of your build.

• Material: Aircraft Grade 7075-T6 Aluminum.
• Weight: 0.2 oz!
• You will need a standard stock wrench to install.
• Type III Hardcoat Anodize.
• Made in the USA!