II
119THCONGRESS
1
STSESSION S. 1374
To amend title 18, United States Code, to prohibit machinegun conversion
devices and illegal modifications of semiautomatic firearms, and for other
purposes.
IN THE SENATE OF THE UNITED STATES
APRIL9, 2025
Mr. H
EINRICH(for himself, Ms. COLLINS, Ms. CORTEZMASTO, Ms. ROSEN,
Mr. F
ETTERMAN, Mr. COONS, Ms. KLOBUCHAR, Mr. KAINE, Mr. REED,
Mr. W
HITEHOUSE, Mr. BLUMENTHAL, Mr. DURBIN, Mrs. SHAHEEN, Mr.
P
ADILLA, Ms. SMITH, Mr. KING, Mr. KELLY, Mr. BENNET, Ms.
D
UCKWORTH, Mr. MARKEY, Mr. VANHOLLEN, Mr. SANDERS, Mrs.
M
URRAY, Mr. WYDEN, Mr. BOOKER, Ms. HIRONO, Mr. WELCH, and Mr.
S
CHIFF) introduced the following bill; which was read twice and referred
to the Committee on the Judiciary
A BILL
To amend title 18, United States Code, to prohibit machine-
gun conversion devices and illegal modifications of semi-
automatic firearms, and for other purposes.
Be it enacted by the Senate and House of Representa-1
tives of the United States of America in Congress assembled, 2
SECTION 1. SHORT TITLE. 3
This Act may be cited as the ‘‘Banning Unlawful Ma-4
chinegun Parts Act’’ or the ‘‘BUMP Act’’. 5
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SEC. 2. PROHIBITION. 1
(a) I
NGENERAL.—Chapter 44 of title 18, United 2
States Code, is amended— 3
(1) in section 921(a), by inserting after para-4
graph (30) the following: 5
‘‘(31) The term ‘semiautomatic firearm’ means any 6
firearm that— 7
‘‘(A) upon initiating the firing sequence, fires 8
the first chambered cartridge and uses a portion of 9
the energy of the firing cartridge to— 10
‘‘(i) extract the expended cartridge case; 11
‘‘(ii) chamber the next round; and 12
‘‘(iii) prepare the firing mechanism to fire 13
again; 14
‘‘(B) requires a separate pull, release, push, or 15
initiation of the trigger to fire each cartridge; and 16
‘‘(C) is not a machinegun.’’; 17
(2) in section 922, by inserting after subsection 18
(u) the following: 19
‘‘(v)(1) Except as provided in paragraphs (3) and (4), 20
on and after the date that is 120 days after the date of 21
enactment of this subsection, it shall be unlawful for any 22
person to import, sell, manufacture, transfer, receive, or 23
possess, in or affecting interstate or foreign commerce— 24
‘‘(A) any manual, power-driven, or electronic 25
device primarily designed, or redesigned, so that 26
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•S 1374 IS
when the device is attached to a semiautomatic fire-1
arm the device— 2
‘‘(i) materially increases the rate of fire of 3
the firearm; or 4
‘‘(ii) approximates the action or rate of fire 5
of a machinegun; 6
‘‘(B) any device, part, or combination of parts, 7
that is designed or functions to materially increase 8
the rate of fire of a firearm, by eliminating the need 9
for the operator of the firearm to make a separate 10
movement for each individual function of the trigger; 11
or 12
‘‘(C) a semiautomatic firearm that has been 13
modified in any way that— 14
‘‘(i) materially increases the rate of fire of 15
the firearm; or 16
‘‘(ii) approximates the action or rate of fire 17
of a machinegun. 18
‘‘(2) Except as provided in paragraph (3), not later 19
than 120 days after the date of enactment of this sub-20
section, any person who lawfully owns or possesses a semi-21
automatic firearm that was modified as described in para-22
graph (1)(C) before such date of enactment shall register 23
the semiautomatic firearm in accordance with section 24
5841 of the Internal Revenue Code of 1986. 25
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‘‘(3) This subsection does not apply with respect to 1
the importation for, manufacture for, sale to, transfer to, 2
or possession by or under the authority of, the United 3
States or any department or agency thereof or a State 4
or Tribe, or a department, agency, or political subdivision 5
thereof. 6
‘‘(4) Paragraph (1) shall not apply to any lawful 7
transfer or possession of a semiautomatic firearm de-8
scribed in paragraph (1)(C) that— 9
‘‘(A) was lawfully modified and possessed before 10
the date of enactment of this subsection; and 11
‘‘(B) is registered in accordance with paragraph 12
(2).’’; and 13
(3) in section 924(a)(2), by striking ‘‘, or (o)’’ 14
and inserting ‘‘(o), or (v)’’. 15
(b) A
MENDMENT TO THE NATIONALFIREARMS 16
A
CT.—Section 5845(a) of the Internal Revenue Code of 17
1986 is amended by striking ‘‘and (8) a destructive de-18
vice’’ and inserting ‘‘(8) a destructive device; and (9) a 19
semiautomatic firearm, as defined in section 921 of title 20
18, United States Code, that is modified as described in 21
section 922(v)(1)(C) of such title’’. 22
Æ
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