The rumor I hear is that California is going to ignore this new law just the way they ignore the federal marijuana law.
If you're from elsewhere, and you get arrested in California carrying a gun, don't expect your license to make much difference in the way they treat you.
The first thing they're going to do is confiscate your gun & the second thing they're going to do is lock you up & charge you with at least three felonies. Illegal carry, illegal importation, and failure to register & pay the taxes. (Basically tax evasion.) They will probably take your car as well as you used it to import the illegal gun.
$150,000 will be the probable Bail, unless you actually discharged the gun in which case you will likely be nailed with at least an illegal discharge. That's if they can't find the bullet. If your bullet hit someone or something, you will be charged with property damage, assault, homicide or whatever, depending on what happened.
So now, assuming no one actually died, figure your bail is going to be somewhere around $250,000 to $500,000 and your stay in California maybe rather longer than you expected.
Beware, but also understand this:
California has the largest number of concealed carry folks in the nation, but because of our laws, only a tiny fraction of them have licenses, or could ever get them.
For instance: If you smoke, sell, grow marijuana, etc, you cannot possibly get a license. You're not even legally allowed to purchase a gun, and under law, you must turn yours in if you own them.
This is absolutely not happening. The number of turn-ins is practically zero. The number of legal users is growing daily.
All those guys growing and transporting and processing are running around with concealed guns, because they don't want to be ripped off. It's too tempting to watch somebody else grow a crop & harvest and then just hijack them.
Or it would be if those guys weren't usually well armed.
I understand that we have the largest number of legal and illegal marijuana growing operations in the entire country, so you can see how this is going.
More and more people here will carry, and more and more will carry illegally.
Unfortunately I don't see how anyone will be correcting the situation anytime soon.