He cannot legally do it, imo. Legally, you cannot by proxy ban something that would ban something you cannot ban regularly..... ie not able to ban cars, but yet banning gasoline, or engines. However it is important to realize the truth behind this action. ammo is not being banned per say, it is being reclassified. This so called ban is specifically to do with green tips, which were immune to a ban on armor piecing rounds before....so what they are doing is removing them from that immunity, which would have those specific bullets banned. not all ar 15 bullets. so.....