[marktwain]

There are legal differences between “firearms” and “airguns”. For example, it is not legal to discharge a firearm inside city limits, except with certain exceptions.

Airguns are exempt, and can be fired on your property inside city limits.

If you have a restraining order against you in a domestic case, you are not allowed to possess fire arms or ammunition.

There are any number of ways a definition can trip you up.

[nonsporting]

“Airguns are exempt...”

Can you cite the ARS section that spells this out? If not, can you cite the case law?

[OneWingedShark]

There are legal differences between “firearms” and “airguns”.
For example, it is not legal to discharge a firearm inside city limits, except with certain exceptions.

Certainly the defense of one's self is such exception?

Art 2, Sec 26
The right of the individual citizen to bear arms in defense of himself or the state shall not be impaired, but nothing in this section shall be construed as authorizing individuals or corporations to organize, maintain, or employ an armed body of men.

If you have a restraining order against you in a domestic case, you are not allowed to possess fire arms or ammunition.

That is despicable and a federal violation of the 5th amendment (curtailing liberty prior to due process, and 6th [requiring the allowance of a defense], via Ex Post Facto law) -- but isn't, strictly speaking, a state-level matter.