The Fortis standard castle nut is machined from billet 7075-T6 aluminum, saving weight over a steel castle nut. It fits mil-spec buffer tubes and installs with a standard stock wrench. Type III hardcoat anodized in black and made in the USA.
- Brand: Fortis Manufacturing
- Type: Castle nut, standard
- Fits: Mil-spec buffer tubes
- Material: 7075-T6 aluminum
- Finish: Black Type III hardcoat anodized
- Weight: 0.2 oz
- Made in USA
- Manufacturer part number: CN-Stand
