/u/Stonechizel used the correct language when he said that self-defense is a Natural right (God-given right, and the only kind of right that actually exists). Natural Law declares that we have the right to life, the right to liberty (pursuit of the good), and the right to property (fruits of our labour). All three justify gun ownership; it is not that gun ownership specifically is a Natural Right -- that would be a made-up, fake civil right, which may or may not exist depending on the State one finds oneself in. But the Natural Rights to life, liberty, and property exist regardless of where you are -- no State can erase those, and therefore no State can remove the right to bear arms.