Prohibitions relating to capacity-based restrictions on firearm magazines

(a) Federal restrictions Section 926 of title 18, United States Code, is amended by adding at the end the following: (d) An officer or employee of the Federal Government may not prescribe or enforce any regulation that imposes any limitation or prohibition in relation to a firearm magazine based on the capacity of the magazine.. (b) State and local restrictions Section 927 of such title is amended— (1) by inserting (a) before No; and (2) by adding at the end the following: (b) A State or local law that imposes any limitation, prohibition, or penalty in relation to a firearm magazine based on the capacity of the magazine shall have no force or effect.. (c) Firearm magazine defined Section 921(a) of such title is amended by adding at the end the following: (39) The term firearm magazine means a fixed or detachable device used to store and feed ammunition into a firearm. The term capacity means, with respect to a firearm magazine, the number of rounds of ammunition that can be stored in the magazine.. (d) Effective date The amendments made by this section shall apply with respect to conduct engaged in 30 or more days after the date of the enactment of this Act.