it's the steel receiver
I don't think heat is the issue; I think (I assume...) it has to be the percussion of the blowback that is just rattling them loose over time; I'm afraid to put too much torque on them, and break them off or strip them out; I have some rocksett left from my suppressor attachment installs; I might try that; my suppressor barrel attachments won't come off, even with heat...
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