You mention that deactivated guns will soon be forbidden. What country are you in?
Well, to be more precise: Deactivated guns are not completely forbidden. We are still allowed to own guns which were deactivated completely according to German laws, but we are not allowed to sell them any more. So some people are litterally sitting on piles of junk metal. This is a gun converted to firing blank cartriges. For decades, these were the slightly better alternative, since depending on the model, more parts were in working condition (not in this relatively recent conversion). If you want to keep these, you have to prove a legal reason why you should own them. Since they are not good for anything, there is no reason to own them. It's not clear yet, but probably ownership will be limited to theatres and film studios.
The only legal alternative are deactivations according to new EU specifications, but I do not know of a single company in Germany that has a license to do this conversion.