I legally purchased one of the original restricted type Norinco 97s. These were then declared prohibited due to the fact that it was determined that they could be converted to full auto too easily. The government was originally going to confiscate without compensation. I did arrange for a court date for an appearance before a judge to determine if there was a case worth hearing. Before this happened the government changed its mind and compensated the full purchase price based on the receipt I still had.
This was an extremely stressful process for a very average completely law abiding citizen (OK I have got 2 speeding tickets in 44 years). There was very little support and trying to do this without putting out money for a lawyer was very hard, time consuming and tough on me. When the officer arrived to pick up the firearm he was very good about the process and quite apologetic. The irony was that a couple of years later I was able to buy a new Type 97 without the selector lever for less money so in effect I made money on the deal. There are a few take aways here speaking from personal experience:
If the government is going to do this, there is likely not a lot you can do about it except comply or be in an illegal situation.
If you are found with prohibited weapons in your possession you are likely to have all your firearms, ammunition etc confiscated and be prohibited from ever owning again, get a suspended sentence and have a criminal record at minimum. This happened to a person that I knew.
You are unlikely to be compensated for accessories such as scopes, stocks etc. So I would not recommend spending a lot of money on these now unless you are in a good financial situation, really want them, and are prepared to have them taken away or left with stuff that you have no firearm to put them on
I recommend enjoying these firearms and shooting them while you still can. Make hay while the sun shines. You don't know what you got till its gone......
We really need to be smart here and calling each other out on a forum that can be accessed by anyone who cares to sign up is not recommended