OK, now you're being borderline dishonest. Nobody but the extreme left fringe is talking about banning guns. At most, they are talking about banning a certain class of guns, which has already been found to be Constitutional in both Miller and Heller.
If you can't ban or restrict any gun at all, then what do you have to say about our ban on full-auto weapons manufactured or imported after 1986? Or our restrictions, and in some states flat out bans, on short-barreled rifles? Or the topic of Miller, sawn-off shotguns? Are those bans and restrictions unConstitutional?
Unless I am wrong, the Miller decision allowed the ban on sawed-off shotguns because they were not a personal weapon suitable for a militia.
*
The Court cannot take judicial notice that a shotgun having a barrel less than 18 inches long has today any reasonable relation to the preservation or efficiency of a well regulated militia, and therefore cannot say that the Second Amendment guarantees to the citizen the right to keep and bear such a weapon*.
https://en.wikipedia.org/wiki/United_States_v._Miller
The AR 15, being the semi-auto version of the current personal weapon of the US armed forces, definitely is a weapon useful to the idea of a peoples' militia.
As for limits on weapons allowed to be held by the people, that is certainly where it gets complicated. The full auto ban, considering the lack of any problem prior to the ban, seems questionable at best. Then one has to consider why there was no problem, and the strict control on them certainly comes to bear. Really, once the state has a list of the people holding militia weapons, then the practical effect of them as a deterrent to tyranny is greatly diminished. I might point to the section of the
Miller decision quoted above, as I think full auto weapons are are very limited use to a non-gov't militia, due to their excessive use of ammo. Yet that is an unsatisfactory answer, but I'm gonna side step the issue (because I don't know the answer) with the caveat that while I would be willing to throw full auto out of the sleigh, the AR 15 type rifle (and 30 round mags) are the minimum standard militia quality weapon, and are therefore clearly protected.
I think bans on short-barreled rifles are clearly unconstitutional.