The DOJ will prosecute you if you possess these items unregistered. An FFL dealer that sells or transfers you any Class 3/NFA firearm without compliance with federal law will be criminally prosecuted and his FFL revoked. These nullification bills are bravado and have no teeth. They are election season fluff. Do not be fooled. Until the bill adds state criminal prosecutions stating that "Federal officials or agents who interfere or impair with the possession of x or y manufactured and possessed pursuant to this Act, shall be guilty of a state felony." At least the state can make a stand with this sort of law, provided the Governor is willing to call out the state police to block the federal marshals from forcing their way into the state jail where the federal official is being held and serving a writ of habeus corpus issued by a federal judge demanding his release, or holding the Governor in contempt of Federal court, seizing him and confining him to a federal facility until he says to the troopers, go home. While we are all dreaming, the so called nullification bill is a dream too.