The next step is to define a 'safe' handgun as one that only works for one state-approved owner, through magnetic rings, biometric grips, or what-have-you; and then to insist that 'safe' handguns link each discharge to that state-approved owner through SSN-coded taggants included in the charge inside each cartridge.
You want a 'safe handgun'?
The State of California will provide you with a 'safe handgun'!
It will be so safe that you won't be able to build, afford, keep, or use it.
And just think - all this from the same guys who can't balance their own budget! What a bargain...