From the Libertarian Party's platform:
[Plank] 1.6 Self-Defense
The only legitimate use of force is in defense of individual
rights — life, liberty, and justly acquired property — against
aggression. This right inheres in the individual, who may agree to be
aided by any other individual or group. We affirm the individual right
recognized by the Second Amendment to keep and bear arms, and oppose the
prosecution of individuals for exercising their rights of self-defense.
We oppose all laws at any level of government requiring registration
of, or restricting, the ownership, manufacture, or transfer or sale of
firearms or ammunition.