I am not sure if there has been threads on this topic here, so I apologize if this is a duplicate... So what does "prospectively" mean in this context? Or is it just a simple placeholder statement, until details are worked out? A lot of people have serious amounts of money in weapons and accessories that could be included in a AWB, for investment/collection or otherwise. Can the legislative branch just declare them to be worthless, by making it illegal to re-sell or transfer them? Can any citizen challenge such AWB being illegal or unconstitutional?