You won't get squat, even if it is written into the law that you are entitled to one. None of the people who mistakenly registered NON-"assault weapons" like handguns and shotguns in 1989 ever got a refund, nor were their records removed from the system even when this was stated right on the registration forms. I do not understand why the kalifornia doj expects people to obey the law when they will not even do it themselves.