WMD Guns Nitromet Castle Nut

Manufactured by WMD Guns
Manufactured by WMD Guns
3 Reviews

In Stock

Standard orders will ship out the same business day if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



Precision machined to meet or exceed Mil-Spec tolerances, the WMD Guns Nitromet Castle Nut has been treated with their proprietary Nitromet coating. This special coating gives each component a tough, corrosion resistant, and increased lubricity for exceptionally smooth metal-on-metal contact. 100% Made in the U.S.A.

  • Compatible with Mil-Spec buffer tubes
  • Nitromet Coating
  • Made in the U.S.A.

WMD Guns has established a reputation of excellence based on extensive firearms and defense industry experience, plating expertise, and gunsmithing capabilities. They are innovators in nickel boron products for the firearms industry and the sole source of the NiB-X nickel boron coating process.
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BrandWMD Guns

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

3 reviews

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Excellent quality


Excellent quality finish on this thing, smooth deep rich black, but more importantly it's a high quality nut. After marring many cheap castle nuts I started spending the extra few bucks on trusted names (BCM, Spikes, Daniel Defense) and haven't looked back. I took a chance on this one for it's finish as there are very few nitride castle nuts out there besides FCD which has those weird dimples. Feels heavy duty like a proper OEM part, has deep notches for staking, and threads on smoothly. If you're on the fence about it but concerned about the above mentioned; buy with confidence.

Sturdy and good finish

by -

Nothing too crazy to say for a castle nut, but I have bought 2 of these and they both have a good finish and fill solid. When I was staking I had a couple times I definitely should have scratched these up but I can't see any scratches so can't do much better than that. These will stay as my go to castle nut.

Quality Part


Was specifically looking for a Nitrided castle nut and chose this. It is cleanly machined, nicely finished and the thread mating fit to the brand new Aero enhanced receiver extension I used was solid with very little play. Very pleased and would definitely buy again.