So when I refuse to insure my small cache of firearms, what will they do?
Tell you to turn in the guns if they are registered. My guess is that they will try to make the gun registrations expire, like a car registration. Then, if you fail to pay the registration fee, they will ticket you. At the time of the annual registration you will be required to show proof of insurance.
This is all conjecture, but it is from hearing the Democrats talk about the benefit of universal gun registration.