Man, I gotta stop working so late...
Combat/military type rifle, CA-legal.
My vote goes for either an M1A (quite prolly the scout model), or an M1, rebarreled in .308. Likely the latter.
I'd use
this one as a model (flash supressor might not be legal), in .308, and likely camo the synthetic stock to your area.
Reasons why --
A -- The main advantages of .223 are -
1 - weighs less, so you can carry more
2 - kicks less on FA
3 - smaller, so you can pack more in a mag.
Since in CA you don't have (1) or (2), and a bunch of .308 in enblocks isn't much of a hassle -- you're not really getting any of the advantages of .223. Hence, I'd stick with .308
B -- You're limited to 10 rounds anyhow, so might as well make it 8 and get better handling, indefinate storage of rounds ready to go, and no $50 magazine worries in the deal.
What you're losing (aside from the obvious)--
ability to mount optics in a decent manner. M1/M1A pattern rifles just don't do that good, IMHO.
-K