Bullshit. Going by this logic I suppose nuclear weapons can't be banned. Because 2nd Amendment.And you cannot ban assault rifles without repealing the 2nd amendment.
The Constitution isn't a suicide pact. We can ban all the military style hardware we want and also regulate the hell out of who gets to and how you get to legally purchase firearms.
What we really do need is to go back to the pre Heller interpretation of the 2nd Amendment.