@nprofile1q... ar-15 is very popular. Many non-gun enthusiasts think of it as an example of uncontrolled gun laws. Often called "weapons of war." This is ironic. The Ar-15 is a semi-auto that was designed to look like the illegal to own M-16 machine gun. The M-16 design became famous in popular culture following photo journalism in the Vietnam war. Current military grade in US is the M4 which is also illegal.