Can you find a CA legal version outside of CA? I suspect a dealer could likely order one assuming Colt has them in inventory. With the demand here, that's not a bet I would make.
I would also be very careful with magazines. Not expecting to come to the attention of law enforcement, those could be a problem in not 10 rounders or less.
Which leads to the next question, where are you planning to go that you think you might need an AR? Very few of us probably carry an AR as a trunk gun in our normal day to day travels. The entertainment media not withstanding we don't have all that many shootouts outside gang territory.
If just for general purposes, thinking things might go to shit while you are here, I might suggest a few cheap used Rugers that aren't encumbered by our silly laws. Those would be enough to let you get out of the situation you found yourself in. And if heaven forfend they ended up in evidence lockers, you wouldn't be all that pissed off, if you weren't in an adjacent people locker. You don't need any kind of long range accuracy in a SHTF scenario. You could retrieve at your leisure, I suspect in AZ you might be able to get several beaters for the price of a new AR.