You can't buy or drive an automobile without insurance.
Why should guns be any different from cars? It's time to get gun owners to pay the cost of gun related crime and injuries. Create an insurance pool where you collect money from mandatory gun insurance which is distributed to victims of gun related crimes, violence and accidents. The amount you collect should be roughly equal to the gun related costs to society.
Driving is dangerous and auto insurance companies base premiums on risk. Drive a fast dangerous car or have a D.U.I. and you pay a lot more in insurance. Gun insurance premiums can be based on similar criteria. Deer rifle in rural PA - small premium. AR-15 in urban CT - high premium.
This will create a market based solution to lowering the risks of gun ownership.