Establish a federally mandated minimum level of malpractice insurance for each gun owner covering each of their guns.
Insurance companies will have strong incentive to review the mental stability, criminal history, reason for purchasing the gun and other factors before deciding if they will issue an insurance policy for gun ownership and determining the appropriate premium.
Law enforcement officers can arrest anyone with a gun who does not have the required malpractice insurance coverage or whose gun is used by others.
Federally mandated malpractice insurance will put private market forces to work to restrict legal gun ownership to qualified responsible individuals.