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a too big of a thread is workable. Too small is bad. At least there is something to work with.
TBH if I had access to a die set I would be inclined to chase the thread up myself but that has been...

Well if it was me making them they would all be done with a tap, but maybe the suppressor was cut with a tool rather than a tap. Coubbee a QC issue?
Do you know anyone else with a similar suppressor...