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Probably legal in CA. I think it's one of the few safe ways to transport a gun in CA, especially when your within 1000 feet of a school. I think they call Unloaded Locked Container Carry, or something like that. It's makes sense too and from the range, but a daily carry is kind of weird. Even being in CA, your probably better off learning some defensive knife skills.
The mag can be near the gun, but not in it. Unless a felony is being committed, then a mag within reach is considered loaded.
I may be a little off on the subject, it's been about a year since I had to look this stuff up.
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One of the best places for info..
http://www.handgunlaw.us/
He's good about keeping it up to date.