Libertarism is more of a moderate thing. Communism is far left wing, Facism is far right wing. Also anarchy and socialism are on the left wing.
The left-right spectrum isn't particularly good for defining anything. Exactly where is anarcho-primitivism supposed to fit on the spectrum? And exactly what makes something "left-wing" or "right-wing" is rather difficult to pin down as well. After all, the Jacobins were considered leftists two hundred years ago, but classical liberals are considered to be right-wing in modern times.
Which brings me to my second point; Libertarianism is not a moderate thing. Any ideology that calls for the elimination of government, or at least the influence of government in one's life, isn't particularly moderate. Secondly, it isn't centrist either, if that's what you actually meant by that statement. Libertarianism can be conservative, as in the case of Grover Norquist, or it can be something like Libertarian Socialism (notably, also known as social anarchism), an ideology to which Noam Chomsky adheres.
Ein Beitrag, der von der amerikanischen Verfassung handelt.
Going off on a tangent, the policy of the Supreme Court has been, for about two hundred and forty years to interpret the Second Amendment exactly as it was written; that people were allowed to own guns while connected to a militia. It was only in 2008 that the Supreme Court ruled (and, if I might interject my opinion here, erroneously, considering the language of the law) that the Second Amendment protects an individual's right to bear arms even when unconnected to a militia.
Regardless of whether one supports or does not support gun control, it's clearly evident by the wording of the amendment that only the right to bear arms in regards to service in a citizen's militia is protected. If the Framers of the Constitution wanted to protect one's right to defend themselves with weapons, they would have put it in the Second Amendment, as the writers of the
Pennsylvania Declaration of Rights did (see Article 13). The Framers would be more than aware of this, and would have included it if they meant that.