You can own one, but it's pretty restrictive s far as what it's configuration has to be. I'm not an expert on CA law regarding ARs, but I know it has to have a bullet button for one. Probably have to have a pinned stock, maybe no flash hider or bayonet lug. No high cap mags I don't think either...
"You'll Never Walk Alone"
"Psycho Murican" -- beeemerdude of Canada