..I would "think"..in CA.
Those 2 words don't belong in the same paragraph.
Looking thru CA's regs they have published,..you talk about a Hodge Podge of Gobbledegook.! A gigantic collection of "feel good" regs that have nothing to do with the lethality of individual weapons. I'm certain LEO's in CA don't know all the regs about whats legal and what's not. I have a feeling they would arrest you on the spot and hold you until they found something in the CA gun laws to get you on.
My kin would surely get a kick out of shooting something different but I probably won't risk it, don't want to end up in Chino because the front sight is fiber optic an not as issued...