Preemption relating to merchant category codes

Section 5313 of title 31, United States Code, is amended by inserting after subsection (g) the following: (h) Merchant category code usage (1) In general No State may prohibit or otherwise deter the usage of any merchant category code established by the International Organization for Standardization for identifying firearm merchants or payment card transactions involving the purchase of a firearm, firearm ammunition, ammunition components for use with firearms, or firearm accessories. (2) Enforcement The Attorney General may bring a civil action in the appropriate district court to enforce this subsection..