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DoubleStar Castle Nut Wrench
$13.99 $11.19 Save 20%
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Most Helpful Positive Review Solid wrench
The Fit is great. I have Used this wrench with both commercial and milspec buffer tubes and it works just fine. This Replaced a wrench that would not work on commercial tubes. It was at a Good price....I have no complaints.
Most Helpful Negative Review armors wrench
Broke right as I turned the castle nut. Wasn’t worth the price at all
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A Basic Castle Nut Wrench That Simply Works

by Omar Stephenson, Verified Owner from NJ, United States Written on June 24, 2025
I bought this for a carbine buffer tube and brace setup on a NJ Other Firearm build. Although it was pretty cheap, it simply worked as it was meant to. I would recommend this for tools on a budget.
Pros:
  • durable
  • Cost effective
Cons:
  • Only use with vise
Would recommend: Yes
Was it helpful to you? Yes | No

Double star castle nut wrench

by Sierragreg, Verified Owner from CA, United States Written on May 15, 2025
This wrench works perfect and does not mar the nut it also has a plastic coated handle for ease of use.
Would recommend: Yes
Was it helpful to you? Yes | No

Castle Nut Wrench

by Patriot, Verified Owner from NC, United States Written on June 20, 2024
Coated handle eliminates sharp edges digging into your hand when removing stubborn castle nuts. Is also great when Removing Dead Air direct thread suppressors.
Would recommend: Yes
Was it helpful to you? Yes | No

Bend easy but work

by Shank, Verified Owner from MS, United States Written on January 12, 2024
Cheap material but it will do the job I still use it
Would recommend: Yes
Was it helpful to you? Yes | No

Awesome product

by Gabe Smith, Verified Owner from AL, United States Written on October 24, 2023
Awesome product, works as it should. It's very sturdy, will buy again.
Would recommend: Yes
Was it helpful to you? Yes | No

Castle nut wrench

by Jigger Tampus, Verified Owner from NM, United States Written on October 19, 2023
Affordable and useful wrench if you want to DIY replacing your castle nut and endplate. It’s so easy and simple to install those two upgrades on your AR. Saved myself from expending money to go to a local gun smith. It’s not a fancy tool like the expensive armorers wrench but again it’s useful.
Would recommend: Yes
Was it helpful to you? Yes | No

Stamped Out Metal

by Chuck, Verified Owner from PA, United States Written on May 22, 2023
You get what you pay for.
This is not the level of quality I prefer to work with.
The tool will work but its not a precision made too.
It will likely mar your finish.
I am going to try to find a better product, that will likely cost a bit more.
Pros:
  • It price right for what you get
Cons:
  • Not really great quality
Would recommend: No
Was it helpful to you? Yes | No

Thin cheap metal

by Jim J, Verified Owner from NC, United States Written on October 26, 2022
This wrench worked fine on a castle nut that was not well staked, but when I tried to loosen a well-staked castle nut on a BCM lower receiver, the lug on the cheap wrench broke off. I should have purchased a good quality armorer's wrench to begin with.
Would recommend: No
Was it helpful to you? Yes | No

Castle nut wrench double star

by Chris Rayburn, from OK, United States Written on July 31, 2021
My castle nut on My AR 15 broke loose and the only way to fix it was to put it back together so I ordered one from optics planet. It was fast delivery even though it was lost in mail. But OP took care of it amediatly. By the way it was my fault the castle nut come loose
Pros:
  • Op is very reliable
Cons:
  • They seem just a little more expensive than some sites and cheaper than others
Would recommend: Yes
1 of 1 found the following review helpful.
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ddoes what it's intended

by KC, Verified Owner from CO, United States Written on February 11, 2021
This wrench is perfect for what it does. If you don't own or can afford a quality armour's wrench and need something to tighten the castle nut then this is the perfect option for you. Great price as well
Would recommend: Yes
1 of 2 found the following review helpful.
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Last updated 2025-11-12 UTC.