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I can't see any advantage to removing the barrel prior to drilling and tapping a receiver. Yes, it makes it easy, but if a gunsmith doesn't know how to use the stop on a drill press and a bottoming tap he is in bad shape.
I don't understand Mtnboomer at all. I have drilled a whole lot of receiver rings with the barrel in place and have never yet drilled into the chamber or ruined the barrel. Also, I have never had any problem removing a barrel that has been drilled into unless the screw broke off in the hole.
AFAIK, all those drill jigs use the bottom receiver flat as the reference point if possible.
Jim
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