Where is "here"?
You could buy it and gift it. But I don't think he can take possession without you shipping it to a local (to him) FFL. And he certainly can't pay you back for your "gift". If there is any ability for someone talking about it to put air quotes around gift like I just did, you could get in trouble for it. It has to be a bona fide gift.
I don't know exactly what you mean by not on CA's roster. If the arms on the roster are legal, he could probably order it locally, if on CA's roster means those firearms are illegal, the only way I can imagine, and this is a long shot- he could join the military, Move his official state of residence to Alaska for tax reasons and get stationed back in California. When I was poking around I saw an exemption to the State AWB for service members assigned to a duty station in California- though registration was still required.