Really wish Todd would rethink the " "Yes, there are certain arms, hand grenades, explosives, other things like that that do not belong in civilian hands."
In text, history, and tradition those items were legal.
You could buy dynamite at the hardware store until the Organized Crime Control Act of 1970, and after that only a $5 license was needed until the Safe Explosives Act of 2002 when the government got paranoid about terrorists.
That said gunpowder is an explosive, although not technically a high explosive, but we shouldn't be telling them they can restrict any common weapons or components a soldier would use, otherwise you might was well cross off the "well regulated" part of the Second Amendment.