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I have been using the standard black ones for years when installing devises that are not timing sensitive and they last quite awhile if its not too big and it smooshes out. They do make some red ones that are supposed to be more heat resistent.
Heat resistant o-rings are available and cheap on Amazon. I use one on a threaded barrel for a compensator For one of my pistols. So far it's worked fine but I also haven't put a thousand rounds through the barrel to give it a ringing endorsement. What I can say is that it was the only way I could get the compensator to stay put and tight. That said I prefer using metal shives to align and hold a compensator when I can. Rubber o-rings just happened to be the thing that worked and that was also what the manufacturer recommended. Not sure how long it would hold up on a long gun but presumably heat tolerances are well, heat tolerances, and it shouldn't matter?
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