SEC. 4. Preemption of certain State laws in relation to firearm silencers.
Section 927 of title 18, United States Code, is amended by adding at the end the following: “Notwithstanding the preceding sentence, a law of a State or a political subdivision of a State that, as a condition of lawfully making, transferring, using, possessing, or transporting a firearm silencer in or affecting interstate or foreign commerce, imposes a tax on any such conduct, or a marking, recordkeeping or registration requirement with respect to the firearm silencer, shall have no force or effect.”.