Apparently AZ1182 is one of those know-it-alls that feeds his buddys bad information. This is Arizona law, nothing to do with vehicles, taxes, insurance, or the color of the moon in AZ1182s world.
For those that have a brain and reading comprehension:
Arizona Revised Statutes - Section 13-3101 (PROHIBITED WEAPONS)
8. "Prohibited weapon":
(a) Includes the following:
(i) An item that is a bomb, grenade, rocket having a propellant charge of more than four ounces or mine and that is explosive, incendiary or poison gas.
(ii) A device that is designed, made or adapted to muffle the report of a firearm.
(iii) A firearm that is capable of shooting more than one shot automatically, without manual reloading, by a single function of the trigger.
(iv) A rifle with a barrel length of less than sixteen inches, or shotgun with a barrel length of less than eighteen inches, or any firearm that is made from a rifle or shotgun and that, as modified, has an overall length of less than twenty-six inches.
(v) A breakable container that contains a flammable liquid with a flash point of one hundred fifty degrees Fahrenheit or less and that has a wick or similar device capable of being ignited.
(vi) A chemical or combination of chemicals, compounds or materials, including dry ice, that is possessed or manufactured for the purpose of generating a gas to cause a mechanical failure, rupture or bursting or an explosion or detonation of the chemical or combination of chemicals, compounds or materials.
(vii) An improvised explosive device.
(viii) Any combination of parts or materials that is designed and intended for use in making or converting a device into an item set forth in item (i), (v) or (vii) of this subdivision.
B. The items set forth in subsection A, paragraph 8, subdivision (a), items (i), (ii), (iii) and (iv) of this section do not include any firearms or devices that are possessed, manufactured or transferred in compliance with federal law.
This is plain English directly copied from ARS and here is a link.
https://www.azleg.gov/ars/13/03101.htm