Gardner claimed that any law or regulation that might prejudice commerce of ownership was an "eminent domain" taking, and so must be compensated. I just pointed out another case where that could happen. If you repeal Obamacare, that would be hundreds of billions a year that Gardner would want you to have to pay.
The reality is that the assault weapons ban is not a taking under eminent domain. No compensation is owed.
Supreme Courts has not struck down the assault weapons ban, yet. We had one before, that sunsetted, but was not struck down. Of course, the Supreme Court is allowed to rule whatever they want, but it would be interesting to get them on record saying that criminals can have any type of weapon they like.
Just a reminder, there is still a machine gun ban, which if the Supreme Court strikes down the assault weapons ban, they will also strike that down.