That is an invalid question. Insane and criminal minds don't follow laws and it is them that by hook or crook steal or illegally get possession of a firearm. It is them that will ALWAYS be able to get possession of a firearm to carry out their insane or illegal acts. That, or put everyone insane, drug addicted, criminal in jail forever.
True. The one thing that Hollywood gets right about gun is that bad guys will always be able to get anything they want, even machine guns.