You need to define"firearms license". There is no license needed to own or to carry a firearm in AZ.
Private citizens aren't permitted to own or possess firearms in Mexico.
They own themselves
Yes. They can build on their own private property.Yes. They can build on their own private property.Yes. They can build on their own private property.Yes. They can build on their own private property.
As many as you want
I think 18.
?
They can't legally own, possess, or have access to firearms, period.
Convicted felons cannot own or possess firearms in any state in the U.S. This includes guns you already own.
In the US, the 1934 National Firearms Act applies, You cannot build a machine gun, and must have an approved request to build a short barreled rifle or shotgun. NO Federal law prohibits you from building an ordinary firearm FOR YOUR OWN USE. However, unless you have a manufacturer's license, you cannot build them for sale. Title 18, US Code, section 922.
Get a Type 7 Federal Firearms License first.
Persons convicted of crimes other than minor traffic violations are not permitted to own firearms. They can apply, but will be turned down almost immediately - you may as well not bother.