That "CA legal" part is the real kicker.
Now, first off, let me explain clearly that I do not like the idea of an AR-style .22LR. I consider it a waste, for most people. For you, because you want a CA-legal rifle, I consider it almost pointless. That's especially true since CA is poised to pass even more idiotic gun laws.
I'd suggest you buy a Marlin 60 or Savage Mark II instead, so that the CA government will have a hard time finding a reason to steal your rifle under the guise of "public safety."
EDIT: Again, the legality issue is one I would take very seriously. If you live in California, your rifle may be subject to confiscation pending new laws which are on the table. There is very little difference in how you would clean a Marlin 60 or Savage Mark II and how you would clean an AR-15, and there are no AR-type .22LR rifles that are exactly like an AR-15. You would have to purchase an AR-15 and then purchase a conversion kit to get a true .22LR AR-15, so there's really no point in you spending twice as much (or possibly five times as much) on an AR-styled .22LR as you would for a rifle that will be more appropriate for California for the foreseeable future.