
I bought to replace the buffer tube on my AR. I went the cheaper route and bought this castle nut wrench instead of the 5x. Cheaper isn't always better, but it worked in this case. This wrench is a special castle nut wrench that is better than multi tools. It fits snugly into the lock's slots, but you must be careful not to let one side of the key slip out of the lock's slot. It has a habit of doing it. The soft grip prevents crushing when hitting the handle to loosen the nut. All in all a good key at a good price.

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