It looks like this gun may have been ordered with 2 7/8 inch chambers. There were a few 20's made on the 0 frame with the long chambers. The ones I have seen went to the west coast. The barrel weigh is also on the heavy side. While your measurement of the OD diameter less the inside diameter is a good sign, the barrels still need to be measured with a barrel wall thickness gauge. IMO, the ribs need to be removed for this restoration to be done correctly. I would say the odds of saving these barrels has gone up.
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