Round and round we go. Still cannot comprehend why some people do not understand that trying to ban certain guns will not make people safer. How many times do you have to say it, laws only affect the law abiding. If someone has their heart set on criminal behavior, they will find a way to do it.
You can ban all of the semi and fully automatic weapons you want. The fact is, they still exist, and people will find a way to get their hands on them. Even if they can't, they will find other ways to carry out their heinous acts. All of these gun free zones are just open invitations to all of these criminals.
We all know what this leads to. If you successfully get the ar15 banned, it doesn't stop there, you'll just move on to the next weapon of choice, until the point comes when they just start doing blanket bans on classes of firearms.
At the end of the day, unless you can ban those guns AND find a way to get the off the street, it will have no impact on the crime rate committed by them.