In lieu of assault weapons ban, require ALL new AND used weapons of mass murder to be registered. Require background check. Tax at 200%. Annual renewal tax: 100%. Buy-back: 300% value of weapon. Enforce stringently.
Why is this important?
What's a realistic way that will actually cut down the number of weapons of mass murder? A ban hasn't passed, and current owners would be exempt. Taking away guns from current owners is a non-starter! BUT Universal registration, annual excise tax, and buy-back are workable, realistic, and cost-effective. The tax can pay to make the policy work. It will take time, but it can be implemented.