I'd not worry about the new barrels, if they are decent quality, if they look right on the gun and the whole thing feels and looks like you want to shoot it and own it. Have a proper look at the gun when it is in your hands, photos are very unreliable. $7,000 is not a lot of money for a best quality sidelock in decent shootable condition - even with new barrels by someone else. See how sharp the action angles and edges are, if the engraving is well defined and the wood fits well and looks comfortable.
