Removes a specific tax-code listing for silencers and treats people who buy or possess a silencer in compliance with federal criminal law (Title 18) as meeting National Firearms Act (NFA) registration and licensing requirements. It also blocks State and local special taxes and local marking/registration rules that would affect silencers in interstate or foreign commerce, requires the Department of Justice to destroy certain federal silencer records within one year, sets new federal marking and serial-number rules for silencers and mufflers, and clarifies this law does not move jurisdiction for these items to the Consumer Product Safety Commission.