Silencers are illegal in every state I know of unless they have been registered and the tax paid. The form 4 is an affirmative defense against prosecution (and unnecessary hassles by the cops). There is no law saying you must keep the form with you. There are however people whose job it is to arrest people who are breaking the law, this brings us back to having an affirmative defense.
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"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens
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