Using your logic, I assume that you would agree that the 2nd Amendment should be limited to the right to bear what were considered arms at the time of the Constitution, single shot muskets, crossbows, swords, etc. but not pistols that can fire more than one shot, and automatic weapons like the AR-15?  

If the intent was to include all weapons that could be carried then it should be legal to own RPGs, grenades, and suitcase bombs.