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BLUF: Stay away from the DPMS AR15 multi tool if you're getting it just for a stock swap.
I'm no expert on the matter, but I do have the tool, and it sucks for tightening the castle nut. The tool appears to be a low-grade steel (maybe cast iron) that was liberally coated with a polymer finish to make it almost impossible to get a good grip on the castle nut. If the finish is worn down at all, it just scratches up the nut itself.
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Trust your hang.
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