That makes no sense.
1.) Comparing a "high capacity" magazine to a nuclear weapon is ridiculous on it's face, not only for the scale of destruction either is potentially capable of inflicting, but also because nuclear weapons are extremely hard to manufacture, move, or store. They're also much easier to trace. In fact, if you don't want to look silly, I would strongly recommend against trying to draw any sort of comparison whatsoever between a magazine with a capacity that you believe to be evil, and weapons of mass destruction.
2.) If they are completely prohibited from being manufactured or imported, do you believe that police officers and the military should have their magazine capacities limited as well?
3.) So, if, in your ideal world, someone is caught with one of these magazines because they have "potential danger" (whatever that means), you are completely ok with charging the possessor with a felony and throwing him in prison? Even though s/he has harmed no one?