The FAB-10 is a California-legal AR-15. It's been remade (IINM specifically for the California market) with a fixed 10 round magazine. In order to reload the magazine, however, you have to break open the rifle (kinda like on a hinge). After reloading, you close it up and lock it back in place. Then you're ready to go. I assume that many accessories that fit the AR-15 also work for the FAB-10. Basically, it would be a gun you use at the range only, since reloading is slow. No personal experience with the FAB-10, but the AR-15 is very light and easy to shoot.
If you are thinking SKS and want something smaller and/or lighter, try to track down a "paratrooper" model SKS. They come with a shorter barrel, so they are a little lighter and IMO balance better. Russian paratroopers are more expensive but nicer than the Chinese ones.
I've never handled a stock Mini-14 so can't really compare, but many shops in California carry the Mini-14 so it shouldn't be too difficult for you to at least shoulder it and see how it feels for you.
If you are only interested in semi-autos, another California-legal choice is the M1 carbine. Oh, and for rimfire the Ruger 10/22 is of course a popular one. HTH.