To overturn it will require a federal court case, which will be in about 3-5 years. What needs to happen to set it up will be some federal court rulings that explicitly say that the 2nd Amendment requires strict scrutiny of gun laws and that an AWB doesn't pass that test, and a case or two that formally debunks the nonsense of the AW term, definition, and intent of the laws. Basically the law is total crap and those upholding it know it, but from 1875 until 2008 the 2nd Amendment was held totally worthless in courts and gun rights accordingly had a century long losing streak. States without a state constitutional provision for right to keep and bear arms––NY, CA, MA, NJ, IL, MD, and HI––could enact as many anti gun laws as they liked and because of political momentum coming from the 1930's and FDR all the way through 1980's, the Democrat party had a virtual monopoly on power and thus complete free reign to do so. With the Sullivan Law as the basis in 1911 there has been an established precedence in society against us and we've only begun trying to fight back in the last decade or two at best.