Cant you just copy the thread length off the old barrel? If you want me to measure the length I can. I believe it is 1.055-20 but I will check. They normally cut the od of the tennon 1.060 so there is no interference fit. On the large shank it is 1.365 long as far as the threads go. You have to have room to back the barrel nut out.Someone chime in on the length of the small tenon as I don't have any barrels to measure as they are in use.
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