I may be the lone man on this one, but I do believe that we do need "some" common sense laws to protect us from those few who shouldn't be allowed access to firearms.
Such as the mentally disturbed, drug addicted, and alcoholics.
Secondly, any law written should be so written that it can not be interpreted in any other way than for the purpose for which it was intended. (yes, I too hate lawyers)
With that said, I'd leave the second admendment in place, with the added clause stating that no local or state law shall circumvent this admendment. In other words, it would become federal law above state's rights.
For the good of the general population, no agency, be it police, FBI, CIA et..al...would have legal access to nuclear, bio, chemical, or any war like mechanical device such as an attack helecopter, tank, submarine, artillery...etc. Yet, any device allowed for police, would also be allowed for the common citizen.
In my world, you would only get one chance to commit a violent crime, if convicted, you get one appeal, if the conviction holds, you die a slow, painful death.....in public.
If you are forced to kill in defense of your life, the life of a loved one, or to protect your private property...(and that includeds your motor vehicle, home, place of business, and your place of employment)....and will not be considered guilty of a crime until your proven to be guilty. If proven inocent, no other legal action from the victums family may at anytime be brought against you.
This is a complicated question needing deep and careful thought, but off the cuff, this is the best I can do for now.....
Perhaps after giving it more thought, I can detail my ideas a little better....