People have the natural right to move/travel, just as they have a natural right to self-defense. Gun rights are natural rights by extention. Logically, if guns are guaranteed as a right because they facilitate self-defense, it follows that cars are a natural right because they facilitate motion/travel.
Also, however, the U. S. Constitution doesn't guarantee gun-ownership as a natural right. The 2nd Amendment specifically states that the right to bear arms is guaranteed because a "well-regulated militia" is needed to safeguard the State. Also, the Supreme Court has already ruled that the 2nd Amendment does not guarantee an absolute right and that licensing and testing requirements would be constitutionally acceptable.
RE: Common Sense on Guns