It's already state law in California that you cannot sell a firearm privately. If you want to sell one you either have to have your own dealer's permit or you have to do it through the dealer. The dealer acts as a middle man and does the background check.
The guy who supplied the guns for the recent terrorist attack in Cali was arrested on multiple charges.
The article phrased the gun arrest for "lying about the intent for the purchase" so I'm guessing that he didn't sell the guns to them but gave to them..which is illegal because that's not what he wrote down.
