I'd say always measure barrels for thickness BEFORE buying or stipulate in the sale that they are a safe thickness. I've looked at a couple of really nice guns at what I thought were good prices only to find thin (.015 on one with pits!) places in the barrels. A good bore scope exam will see pitting that you won't see peering down the barrel as well. I think there is a fair number of guns that have been severely honed trying to clean them up for sale. They look smooth and shiny but a micrometer and exam say no! Might save a new owner a big disappointment. Certainly has saved my bacon.
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