New production is slightly different from the original. If you send them a extra barrel they alter the receiver so it will only take the later barrels. What many are trying to do is have a set of period barrels fit to their gun without altering it so the original barrels still fit. Les could do it in his sleep without changing the original barrel fit.

I am about to take a 28 gauge back to them for service. It just wont cycle well without ejecting the loaded shell and then the empty. You get the dreaded Benelli click. The 28 is a delight to shoot and I expect this will be a easy repair.