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I agree but you would think that the suppressor is done with a standard tap or setting on the cnc.
Then its only the barrel that needs fitting but I spose if the suppressor is machined on a lathe...

I always turn the major diameter of the soon to be thread a tad under-how much depends on the diameter of the thread.
They grow a little when you cut them so to speak, more noticeable when the...

Mind you most threads don't usually measure over.