What Scalia said on FOX this last weekend was his interpretation of "bear arms" meant what a single citizen could carry. Which would be the same as what a foot soldier would be able to carry. As for ships and artillery (18th century or today) acquisition of those would require a FAIR FIGHT between the now rogue tyrant militia of the federal government and the new revolutionary civilian militia. No one wants massive destructive weapons in the hands of the Chicago SEIU or ACORN, or the TEA party. Those will have to be fought for and won. It will be mess, costly and very bloody but revolutions are just that. But it it the common citizen that must have an EQUAL fighting chance against federal foot soldiers. They knew back then that urban sniper and terror tactics can defeat even the largest and best equipped armies.
The Constitution’s “Letters of Marque and Reprisal” clause presumes the private possession of battleships and cannons.