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Bought one of these from a forum member a while back. The only difference between the CA version and the non-CA version is the addition of a small safety that is attached to the trigger. Its just a small button that slides out and interferes with the body of the gun when in the safe position.
Its pretty much a joke. It is one of those things that was obviously added to meet some BS regulations and never used in real life. IMO if you left the safety on and had to use the gun in an emergency, you might as well throw the gun at the BG because your gonna have a tough time clicking off the safety and taking a shot.
The good news is that when the safety is off you don't even know its there (by design I suspect).