It *might* be possible to zero it with the set screw prior to drilling it. I de-banned a barrel in 2004-2005 with a used lugged FSB(mod'd to use 8-32 set screws) and for some reason I think I was only snugging the bottom screw down to zero it prior to tightening the 4 upper screws.
Of course (even if the memory is right on that) getting it from the range to underneath a drill bit without something off getting out of alignment could be an issue.



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