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If the accuracy suffers because of a poor recrown or workmanship, then there is recourse to have the crown/work redone. As for barrel stresses, most overbarrel suppressors actually help to support...

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...