builder

According to the website it mentions only the new set of barrels, not the first set. I suspect that the gun has just the new set of barrels. I could be wrong. It sounds to me that the first set of barrels were trashed and the owner chose to have a new set made rather than have the old set sleeved. Maybe he did not want a "heavy sleeved barrel" and had enough money to have the job done first class. Still I would look at the entire gun and make sure that this os not one which has seen extensive heavy use. New tires does not make a cream puff in a car and new barrels does not make a mint condition gun.