Just like many things these will be add-on's to go with other things. Since this is a forum about AR's I am constantly amazed at how many have no clue about other laws once they venture out of the AR world.

How many have bought an SKS and then purchased a 20 rd mag for it? for most of them you just broke the law. The staff has flagged many sales because the gun was not 922r compliant and most of the sellers had no idea.

While I know of not a single person charged with it alone I have seen it added on to other charges.