Removes certain National Firearms Act (NFA) text naming silencers, treats persons who acquire or possess silencers under federal criminal law as satisfying NFA registration/licensing requirements, preempts many state and local taxes/registration rules on silencers, requires manufacturers/importers to mark silencers with serial numbers, directs the Attorney General to destroy silencer-related federal registration records, and adds a 10% federal excise tax on silencers. Key deadlines: many tax/code changes apply to calendar quarters beginning more than 90 days after enactment, and the Attorney General must destroy listed records within 365 days of enactment.