I would rather have the barrels replaced by the maker. But they might have been out sourced to the same man for the job. The obsession for original parts and original condition is just silly sometimes. Ask a Brit about what value reduction such a gun might be subject to over there. For me I would rather have replaced barrels than sleeved one and sleeved one rather than worn out ones.
When you have it evaluated ask if the barrels are well done and do they fit and balance well with the gun. If so do not worry about it. What are you looking for a 10 percent rule? I do not think a hard and fast rule exist. Unless is is a very high grade gun I would be tolerant of replacement barrels if they pass muster. Buy the gun not the name and the function should be good for the long haul with new barrels.
