The only risk with threading is if you try to do it yourself. If it is done by a Gunsmith then it will be recrowned etc as well. (defined as Competent, with decent gear, and who knows how to use that gear properly) These "experts" you speak of, sound like they have just enough information to be dangerous (especially to your hearing) All the rifles that we have had suppressed, for my own use or for others, have performed at least as well as before they were threaded. Most performed better with only the 22LRs not seeing much improvement. (But the 22s did get really quiet)
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