I have a six barrel set Beretta, some fitted by Beretta USA, none matching except the original. I have several Kreighoffs with extra barrels, some fitted at Kreighoff USA, none of the extra barrels match the originals. I have several Parkers with extra barrels that are not original to the gun, all but one set are not numbered to the original gun. The only one I am disappointed with is the Parker that I had numbered to the original gun more than thirty five years ago. I am afraid that someone will think I was trying to pull a fast one on a potential buyer. "Found" extra barrels should not be numbered to the original guns except by fakers and thieves. I'm sure there are those that disagree and I will read their posts and reconsider.