I could almost envision so-called "assault weapons" and other heinous "weapons" du jour pushed over to the purview of NFA/Title II weapons. Not quite banned, but transfer and interstate transport would be heavily restricted.
I could this also. No laws needed, just reclassify "assault" weapons and high cap magazines to NFA Class II weapons. 6month wait, $200 tax stamp, STRONG background check would crush sales.
