Let's set the bad guys aside and just focus on the regular ole American citizen who likes to target shoot, hunt, etc. Make a list of which weapons these people (again, not the bad dudes) should not have the right to own and which weapons they should have the right to own.
I believe that the right to keep and bear arms is a universal human
right, not limited to American citizens except by tyrannical governments.
I believe this human right extends to all personal weapons, including but not limited to all handguns; all rifles; all muscle-powered projectile weapons; all knives and swords and other melee weapons; and all single-target less-lethal weaponry.
I think fully automatic weapons-- machine pistols, submachine guns, assault rifles, and light and heavy machine guns-- should be legal for citizens, ideally, but I do not consider licensing or even outright bans of these weapons to be meaningful infringements of the right to keep and bear arms. Frankly, they are not very useful for civilians whether their purposes are lawful or otherwise.
I believe that explosives more powerful than commercial fireworks should require a license. All forms of anti-personnel explosive devices, all artillery, and all explosive ordnance should be restricted to lawful militia training and strictly controlled, but I believe that State-sponsored and well-regulated militia groups should have access to them in case of need.
I believe that all nuclear, biological, and lethal chemical weapons should be prohibited even from State use and that governments that maintain stockpiles of these weapons should be sanctioned by the international community.