Technically, the right is not gun ownership, but the right to use guns in a well regulated militia. Gun ownership is a privilege and it amazes me that as a country we entirely seem to have collective amnesia on the "well regulated" parts of the Second Amendment.

Not to mention that at the time of the Second Amendment's writing gun technology was primarily limited to muzzle loaders. If you want to argue that modern cartridge loading guns get grandfathered into an "ownership right" implied by the Second Amendment, then lets argue that drone technology is also a new technology development that is equally likely to fit within some auspices of the right to bear arms (or the right to a free press in view of camera drones) and thus is equally a so-called "defined right".