I have just taken apart my sav 340, in .223, and the threads are close to the NRA guide. Mine actually measure .864" - 18tpi. I assume that is undersized for a 7/8" shank. Just thought I would post that info in case anyone was looking. I had actually seen the info from the NRA guide and posted somewhere on this forum awhile ago... Wanting to correct, or be more accurate in the measurements I guess...
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