Anyone know what the OD is for the Phantom Breech inserts where the feed tube sits? I know the ID is 8/32 but I'm in need of purchasing a drill/tap and would like to know what size drill bit and tap to get. I'm planning to install this insert on a modified kingman hammer to use as stock class. Unfortunately, the existing hole is already worn out and figured using one of these breech inserts would work. Thanks in advance!
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