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Mine was split right in half at the top of the "O" on the lower receiver that goes over the buffer tube. Cause no issues for me... but I epoxied and clamped, just to keep it together.
That was my case. Is he gassing it up properly? I don't want to sounds like I know more then I do, but mine had the same "issue" when i got it, and I was just not gassing up properly...
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