I believe something lost on folks that want to say the fore fathers never invisioned AR-15's and high cap mags is that the 2nd amendment was meant to balance the technology of the military of the time and the 2nd was meant to give citizens comparable weapons.
As recenlty as last week, I heard Michael Moore and piers Morgan debate this. They were basically saying the 2nd amendment gives us citizens the right to single shot muzzle loaders.
Now Scalia is saying something similar:
http://www.nationaljournal.com/scali...lated-20120729