I really doubt that there any state or federal specifically agianst airsoft in arizona (I know they're banned in several states but i think that is about it).
so, as i now understand, it's totally illegal to discharge and airsoft on public land within city limits. i dont know of any laws against Airsoft, but my family owns several guns and i am familiar with arizona (real) gun laws.
i think i finally understand it, the definition of a firearm is very broad under the law, and airsofts fall under that broad definition and therefor the same laws that apply to real guns apply to airsoft guns.