Yep, as long as the firearms were for himself, there's nothing illegal about it under Federal law (and Arizona as far as I know).
He's an idiot though. This proves nothing...law-abiding citizens are allowed purchase firearms in free states.
It would have been a good case if he wasn't eligible, but passing a background check should enable him to purchase firearms!
Hell, he could have asked me; I would have told him that.
And he's full of shit about this stunt as well. I'm glad he's being publicly embarrassed about it. Just shows you how ridiculous the liberal anti-gun efforts will go to make-up bullshit to defend themselves...