Expo Arms Mil-Spec Steel Castle Nut

Manufactured by Expo Arms
6 Reviews


In Stock

NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.

We are fully staffed and processing orders. Standard orders are shipping in approximately 2 business day. FFL orders take approximately 14-16 business days if you can provide us an actively receiving FFL location.


In Stock


The Expo Arms Steel Castle Nut is a Mil-Spec castle nut for use with AR-15 carbine receiver extensions. Proudly made in the U.S.A.


BrandExpo Arms
TypeCarbine Castle Nut

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

Ratings & Reviews

6 reviews

  • 4 stars
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  • 3 stars
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  • 2 stars
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Does what it should

by -

cheap. works well..

Pure garbage

by -

Threads were jacked up. Do not buy.

Doesn't fit

by -

Didn't fitton the buffer tube. Started to thread on but started to strip the threads. Tried a different castle nut and it worked just fine. It did fit my wrench though.
<br>From PA: We're very sorry to hear that you had this issue. We'd be happy to replace this for you.

great part

by -

excellent part. much better than the end plate they offer

Heavy duty castle nut

by -

This is a very nice heavy duty castle nut with great finish. Fast delivery as usual too!

Good Part

by -

Fit and finish on this castle nut is excellent. Uniform Parkerizing, fit both a 3-point stock wrench and a mil-spec buffer tube from another manufacturer perfectly. Works as it should. Couldn't be happier!