Arizona
Arizona Governor Jan Brewer signed Constitutional Carry Legislation into law in 2010. This legislation removed the requirement to have a conceal carry permit in the state.
Arizona’s Constitutional Carry applies to residents and non-residents of the state.
The Arizona law has a few caveats, for instance, you can not conceal carry in bars or establishments that serve alcohol if you do not have a permit. You have to be 18+ in the state to open carry and 21+ to conceal carry.