• Ultra Lightweight yet durable
  • Unique machine work to enhance appearance
  • Works with both AR-15 and AR-10
  • Compatible with All Mil-Spec buffer tubes
  • Designed and Manufactured in U.S.A.


  • Material: 6061-T6 Aluminum
  • Finish: Type III Hard Anodize
  • Weight: 0.21 oz.
  • Thickness: 0.374"


  • AR-15 and AR-10


When you’re building a reduced weight AR it doesn’t mean you have a heavyweight wallet to back up your dreams. Enter the 2A Armament Builder’s Series Aluminum Castle Nut, the reduced weight castle nut that won’t leave your wallet light.

Save Weight Without Sacrificing Class

The 2A Armament Builder Series Aluminum Castle Nut offers a significant weight reduction over traditional Mil-spec steel castle nuts. 2A machines quality 6061-T6 Aluminum billet using a reduced weight design that not only brings it in at just two-tenths of an ounce but also gives it a unique appearance that adds aesthetic value to your build as well.

Beauty Anodized to Last

The 2A Armament Builder Series Aluminum Castle Nut doesn’t just look good right out of the box, it’s meant to stay that way. 2A added a quality Type III Class 2 Hard Anodized finish to this castle nut to keep it pretty and functional over a long service life. It will withstand the rigors of life in the field and resist corrosion no matter what your operating environment offers up. Likewise, it’s tough enough to absorb the occasional trip back to the bench when you can‘t help but tinker with that build you love. Corrosion and scratch resistant, peel proof even, 2A’s castle nut is the perfect component to bring your build together.

Great Value and Customer Service That’s on Point

When you choose components from the 2A Armament Builder’s series line and buy them from Wing Tactical, you get great value and service that makes the difference. From planning to troubleshooting, our customer service people are ready to help you every step of the way. We know the AR platform because we’re builders and shooters like you. When you need advice and quality AR parts and accessories, choose Wing Tactical and Give Yourself an Edge.

Have a question?

Ask an Expert