II 

115TH CONGRESS 

2D SESSION S. 2475 

To amend title 18, United States Code, to prohibit the illegal modification 

of firearms, and for other purposes. 

IN THE SENATE OF THE UNITED STATES 

FEBRUARY 28, 2018 

Mr. FLAKE (for himself, Mr. HEINRICH, and Ms. CORTEZ MASTO) introduced 

the following bill; which was read twice and referred to the Committee 

on Finance 

A BILL 

To amend title 18, United States Code, to prohibit the illegal 

modification of firearms, and for other purposes. 

1 Be it enacted by the Senate and House of Representa2 tives of the United States of America in Congress assembled, 

3 SECTION 1. SHORT TITLE. 

4 This Act may be cited as the ‘‘Banning Unlawful Ma5 chinegun Parts Act of 2018’’ or the ‘‘BUMP Act’’. 

6 SEC. 2. PROHIBITION. 

7 (a) IN GENERAL.—Chapter 44 of title 18, United 

8 States Code, is amended— 

9 (1) in section 921(a), by inserting after para10 graph (29) the following: 


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1 ‘‘(30) The term ‘semiautomatic firearm’ means any 

2 firearm that— 

3 ‘‘(A) uses a portion of the energy of a firing 

4 cartridge to extract the fired cartridge case and 

5 chamber the next shell or round; 

6 ‘‘(B) requires a separate function of the trigger 

7 to fire each cartridge; and 

8 ‘‘(C) is not a machinegun.’’; 

9 (2) in section 922, by inserting after subsection 

10 (u) the following: 

11 ‘‘(v)(1) Except as provided in paragraphs (3) and (4), 

12 on and after the date that is 120 days after the date of 

13 enactment of this subsection, it shall be unlawful for any 

14 person to import, sell, manufacture, transfer, receive, or 

15 possess, in or affecting interstate or foreign commerce— 

16 ‘‘(A) any manual, power-driven, or electronic 

17 device primarily designed, or redesigned, so that 

18 when the device is attached to a semiautomatic fire19 arm the device— 

20 ‘‘(i) materially increases the rate of fire of 

21 the firearm; or 

22 ‘‘(ii) approximates the action or rate of fire 

23 of a machinegun; 

24 ‘‘(B) any device, part, or combination of parts, 

25 that is designed and functions to materially increase 


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1 the rate of fire of the firearm, by eliminating the 

2 need for the operator of the firearm to make a sepa3 rate movement for each individual function of the 

4 trigger; or 

5 ‘‘(C) a semiautomatic firearm that has been 

6 modified in any way that— 

7 ‘‘(i) materially increases the rate of fire of 

8 the firearm; or 

9 ‘‘(ii) approximates the action or rate of fire 

10 of a machinegun. 

11 ‘‘(2) Except as provided in paragraph (3), not later 

12 than 120 days after the date of enactment of this sub13 section, any person who lawfully owns or possesses a semi14 automatic firearm that was modified as described in para15 graph (1)(C) before such date of enactment shall register 

16 the semiautomatic firearm in accordance with section 

17 5841 of the Internal Revenue Code of 1986. 

18 ‘‘(3) This subsection does not apply with respect to 

19 the importation for, manufacture for, sale to, transfer to, 

20 or possession by or under the authority of, the United 

21 States or any department or agency thereof or a State, 

22 or a department, agency, or political subdivision thereof. 

23 ‘‘(4) Paragraph (1) shall not apply to any lawful 

24 transfer or possession of a semiautomatic firearm de25 scribed in paragraph (1)(C) that— 


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1 ‘‘(A) was lawfully modified and possessed before 

2 the date of enactment of this subsection; and 

3 ‘‘(B) is registered in accordance with paragraph 

4 (2).’’; and 

5 (3) in section 924(a)(2), by striking ‘‘, or (o)’’ 

6 and inserting ‘‘(o), or (v)’’. 

7 (b) AMENDMENT TO THE NATIONAL FIREARMS

8 ACT.—Section 5845(a) of the Internal Revenue Code of 

9 1986 is amended by striking ‘‘and (8) a destructive de10 vice’’ and inserting ‘‘(8) a destructive device; and (9) a 

11 semiautomatic firearm, as defined in section 921 of title 

12 18, United States Code, that is subject to the prohibition 

13 under section 922(v)(1)(C) of such title 18’’. 

Æ 


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