While you're likely NOT serious
the reality is that weapon as pictured was already banned in California. Since banning it 10X won't prevents incidents like this what do you do now?
The motivation of CA politicians has NEVER been about fighting crime when it comes to guns. It has always been about pushing a moral agenda. The fight that California is making isn't about reducing crime it's about criminalizing being a gun owner because they don't morally approve of ANYONE owning guns.
Case in point, certain cities in California, led by San Francisco, are pushing to make it a misdemeanor for anyone(including retired LEOs) to own a magazine capacity > 10 rounds. They claim this is about crime and it will be a 'deterrent'.
NYTimes did a survey recently of criminal shootings, they found that >90% of all the people prosecuted had extensive criminal history. It's safe to say for 85+% of those people it would have been a felony to even possess ANY gun regardless of the capacity of a magazine.
If it's already a felony to posses a firearm by most criminals involved in shooting and it STILL doesn't deter them, how will adding a misdemeanor based on the capacity of the magazine deter them further? Simply put it won't, adding a misdemeanor to a crime that's already a FELONY will have no added deterrence.
So if it's not about deterring crime then what it is about? Frankly who's going to be affected more by said regulation, criminals(which it won't deter) or a much larger number of otherwise legal gun owners?
In all cases these laws could be narrowly written to directly target crime. They aren't because crime isn't the target, gun owners are. So they make these laws as broad as possible so the vast majority of people affected by them are otherwise lawful citizens.
This isn't a left or right issue, this a power and politicians issue. On the left they morally object to ANYONE owning guns so they make it a crime to do so. On the right they object to anyone getting an abortion and so they make it a crime to do so.
At some point we have to tell both sides to stop making it a crime to disagree with your moral point of view.