I want a national gun registry. If you want to fearmonger about it, that's your call, but it needs to be done. Gun owners need to be given regular psychological screenings to make sure that they are mentally equipped for the responsibility of owning a gun. Just because you had good intentions for your gun in 2011, doesn't mean you do now. Trigger locks are a must and could go a long way toward preventing family members from getting hold of a weapon in the household. Proper storage is crucial. Simply put, whatever creates some distance between the impulse to kill and the hand on the trigger could be beneficial in limiting mass homicide. The determined will try, but it should be a real pain in the ass.
There's no chance that all the guns will be melted down this week or in 20 years. America is different in that regard. So the entire system of distribution needs to be rebuilt from the ground up and we need to do everything in our power to make sure that our country's gun owners are as responsible as they claim to be, which is where training comes into play. The 2nd amendment connects gun ownership with a "militia." It should take a lot of work and responsibility to own a gun, a responsibility that is maintained, if we follow that logic.
Above all, I'm sick of hearing the "but it won't stop crazed killers" qualification that's attached to any suggestions for reform. We have no idea how changes to policy will affect the culture over the span of several generations. I want the chance to find out. No more hand-wringing from the right.