The first amendment has restrictions. The second amendment has no restrictions. These weapons are not in the hands of “well-regulated” militias. The changes the people are demanding do not desecrate the second amendment, they just make it a safe addition to our constitution.
1. Well regulated militias: The 2nd Amendment afford "all" citizens the right to bear arms so that should a "well regulated citizens militia be needed," they would have their own weapons to provide for that militia.
2. The concept when the 2nd Amendment was enacted, was so that the citizenry would be "similarly" armed against a tyrannical government, including our own, should it become tyrannical. Thus, the weapons like the AR-15, while not fully-automatic, are close to a military rifle and to be kept by the citizens, should our own government, or a foreign government, try to impose its oppressive will upon the people.