Ron,
I checked the dollshead to barrel breachface fit by flipping the barrels over and the distance from the breach and dollshead dimensions let it fit the frame. So, no material removal from the breachface should be needed to fit the barrels. The material needs to come off the hinge (hook) fulcrum on these barrels for this gun. The barrels come within about .050" at the top of the frame/barrels of closing. I'm guessing that translates into maybe .010" material removal at the hinge.
I've not fitted a set of barrels but everyone that has told me they have, have fitted by hand work. File and polishing work of the hinge.
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