Gary, I'm sure you already know, but just in case, for 25.00 plus postage Krieghoff will trade you what you want for whatever you have. Andy p.s. they will ship same day and refund the difference when you return the used one (within two weeks of purchase)
I have done this more than once. It is easy to do and they are quick responding. Just carefully put your barrel in a protected vise. With a Nylon stick, after removing the pin with a small drift, drive the hanger out of the Dovetail. Reverse to reinstall new one. Hint the number should go to the Front so you can verify. It can go on either way. It does make the POI of the Bottom Barrel move. So best to pattern before and after. It helped me alot. Pat