That is way cool, deerchop. I'm not familiar with a 9mm shotgun. I'll have to read up on it. I shoot Fiochi .25 rounds..and they perform well.
Your Walther may can be placed back in good order, with a safety. I wonder why they did that ?? Sounds like a nice rifle. It might be well worth looking into finding/buying a safety for it...and put that vintage bad boy on some squirrels !