In my opinion, assault rifles and like weapons are precisely what the second amendment would protect more than any other gun type, in this modern day and age. In the days of old, flintlock muskets were enough for the citizens to own for thwarting tyranny but now we would need something more modern and powerful to equal what 'they' would have, whoever 'they' might be. Defense against tyranny is the biggest reason the founders created the 2nd amendment. The primary object of the amendment was to deter a tyrant from taking over in the first place, not so much to regain control after one took over. It's all about prevention and being a threat to give power-hungry types second thoughts.