This goes back to the joke about the World Famous French lover who was on a game show as a lifeline. The punch line is that he wouldn't have done anything the contestant suggested. The "gun violence" situations is really like that. With pretty much everyone knowing that the US needs to rein in the weapons.
Yet nobody is doing anything about it.
Come on! You are worried that assault weapons are going to be banned whether you are "pro" or "anti". The pro-AW crowd is hording the things knowing that there will be a huge rise in their price the next time they get banned. That is if the current ones aren't removed from circulation. But I doubt that will happen.
I think the ones in circulation will be "grandfathered" and remain in circulation.
Any gun buyback would cost a lot in the US because the situation was allowed to get out of control.
And the current situation of US politics has ensured that guns will be a problem.
This is worth a read since it gets into the problems this issue raises: