Not happening. Again, you are approaching from a supply side. That battle is already lost. The key is to limit transport, require licensing and training, proper storage, background checks etc... there will never be an out and out ban, and most bans just grandfather in the existing hundreds of millions of guns. You know what the AWB did? It made preban rifles and mags slightly more expensive. That's it. Gun control will be a grind and a half politically. Starting at "well just ban all semis" isn't going to get anywhere.