You cannot legally buy a handgun “out of state”. You can only buy in your state of residence. An out-of-state dealer can sell you a handgun, but only by transferring to a licensed dealer in your state. That’s Federal law.
California has many added restrictions. What with San Berdoo and all, it is probably a bad time to try and skirt either California or Federal gun laws.
I don’t think you people are very creative