Come on. That is a distinction without a difference. The evidence is much stronger for the type of gun than the type of van. There are not millions of these types of guns being carried daily but there are millions of white vans on the road every day.
I'm not going to use hyperbole but I am listening to gunowners in Maryland and they are telling anyone who wants to hear.
The ATF is building a database and questioning gunowners. It's happening right now. If you don't want to listen that's fine but gunowners in MD are seeing it happen.
People are getting visited by the ATF for no other reason than the caliber of their weapon. Range logs are getting pulled. 4473's (in direct violation of law) are getting copied by LEO and guns are getting sent in (voluntarily?) for testing.
Ponder what I'm saying. It is happening.