1. Short title This Act may be cited as the Banning Unlawful Machinegun Parts Act of 2018 or the BUMP Act . 2. Prohibition (a) In general Chapter 44 of title 18, United States Code, is amended— (1) in section 921(a), by inserting after paragraph (29) the following: (30) The term semiautomatic firearm means any firearm that— (A) uses a portion of the energy of a firing cartridge to extract the fired cartridge case and chamber the next shell or round; (B) requires a separate function of the trigger to fire each cartridge; and (C) is not a machinegun. ; (2) in section 922, by inserting after subsection (u) the following: (v) (1) Except as provided in paragraphs (3) and (4), on and after the date that is 120 days after the date of enactment of this subsection, it shall be unlawful for any person to import, sell, manufacture, transfer, receive, or possess, in or affecting interstate or foreign commerce— (A) any manual, power-driven, or electronic device primarily designed, or redesigned, so that when the device is attached to a semiautomatic firearm the device— (i) materially increases the rate of fire of the firearm; or (ii) approximates the action or rate of fire of a machinegun; (B) any device, part, or combination of parts, that is designed and functions to materially increase the rate of fire of the firearm, by eliminating the need for the operator of the firearm to make a separate movement for each individual function of the trigger; or (C) a semiautomatic firearm that has been modified in any way that— (i) materially increases the rate of fire of the firearm