I 
117TH CONGRESS 
1ST SESSION H. R. 5427 
To regulate bump stocks in the same manner as machineguns. 
IN THE HOUSE OF REPRESENTATIVES 
SEPTEMBER 29, 2021 
Ms. TITUS (for herself and Mr. KILDEE) introduced the following bill; which 
was referred to the Committee on Ways and Means, and in addition to 
the Committee on the Judiciary, for a period to be subsequently deter-
mined by the Speaker, in each case for consideration of such provisions 
as fall within the jurisdiction of the committee concerned 
A BILL 
To regulate bump stocks in the same manner as 
machineguns. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Closing the Bump 
Stock Loophole Act of 2021’’. 
SEC. 2. BUMP STOCKS. 
(a) IN GENERAL.—Section 5845 of the Internal Rev-
enue Code of 1986 is amended— 
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(1) in subsection (a), by striking ‘‘and (8) a de-
structive device.’’ and inserting ‘‘(8) a destructive 
device; and (9) a bump stock.’’; and 
(2) by adding at the end the following new sub-
sections: 
‘‘(n) BUMP STOCK.—The term ‘bump stock’ means 
any of the following: 
‘‘(1) Any manual, power-driven, or electronic 
device that is designed such that when the device is 
attached to a semiautomatic weapon, the device 
eliminates the need for the operator of a semiauto-
matic weapon to make a separate movement for each 
individual function of the trigger and— 
‘‘(A) materially increases the rate of fire of 
the semiautomatic weapon, or 
‘‘(B) approximates the action or rate of 
fire of a machinegun. 
‘‘(2) Any part or combination of parts that is 
designed and functions to eliminate the need for the 
operator of a semiautomatic weapon to make a sepa-
rate movement for each individual function of the 
trigger and— 
‘‘(A) materially increases the rate of fire of 
a semiautomatic weapon, or 
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‘‘(B) approximates the action or rate of 
fire of a machinegun. 
‘‘(3) Any semiautomatic weapon that has been 
modified in any way that eliminates the need for the 
operator of the semiautomatic weapon to make a 
separate movement for each individual function of 
the trigger and— 
‘‘(A) materially increases the rate of fire of 
the semiautomatic weapon, or 
‘‘(B) approximates the action or rate of 
fire of a machinegun. 
‘‘(o) SEMIAUTOMATIC WEAPON.—The term ‘semi-
automatic weapon’ means any repeating weapon that— 
‘‘(1) utilizes a portion of the energy of a firing 
cartridge or shell to extract the fired cartridge case 
or shell casing and chamber the next round, and 
‘‘(2) requires a separate function of the trigger 
to fire each cartridge or shell.’’. 
(b) AMENDMENTS TO TITLE 18, UNITED STATES 
CODE.— 
(1) Section 921(a) of title 18, United States 
Code, is amended— 
(A) in paragraph (3), by striking ‘‘muffler 
or firearm silencer’’ and inserting ‘‘muffler, 
firearm silencer, or bump stock’’; and 
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(B) by adding at the end the following: 
‘‘(36) The term ‘bump stock’ has the meaning given 
such term in section 5845(n) of the National Firearms 
Act (26 U.S.C. 5845(n)).’’. 
(2) Section 922 of title 18, United States Code, 
is amended— 
(A) in each of subsections (a)(4) and 
(b)(4), by inserting ‘‘bump stock,’’ before ‘‘ma-
chinegun’’; and 
(B) in subsection (o)— 
(i) in paragraph (1), by inserting ‘‘or 
bump stock’’ before the period; and 
(ii) in paragraph (2)— 
(I) in subparagraph (A), by strik-
ing ‘‘or’’ at the end; 
(II) in subparagraph (B), by 
striking the period and inserting ‘‘; 
or’’; and 
(III) by adding at the end the 
following: 
‘‘(C) the otherwise lawful possession of a bump 
stock that, on or before the date that is 1 year after 
the date of the enactment of this subparagraph, is 
registered to the possessor in accordance with sec-
tion 5841 of the Internal Revenue Code of 1986.’’. 
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(c) EFFECTIVE DATE.— 
(1) IN GENERAL.—The amendments made by 
this section shall take effect on the date of the en-
actment of this Act. 
(2) APPLICATION TO POSSESSION ON DATE OF 
ENACTMENT.—Notwithstanding paragraph (1), any 
person on the date of the enactment of this Act pos-
sessing a bump stock as defined in section 5845(n) 
of the Internal Revenue Code of 1986 (as amended 
by this Act) shall, not later than the date that is 1 
year after the date of the enactment of this Act, reg-
ister such bump stock in accordance with section 
5841 of the Internal Revenue Code of 1986 and in-
clude with such registration the information required 
under section 5841(a) of such Code. Such registra-
tion shall become a part of the National Firearms 
Registration and Transfer Record required to be 
maintained by such section. The prohibition on pos-
session of an unregistered firearm under section 
5861 of such Code shall not apply to a bump stock 
described in this Act on any date that is 1 year or 
less after the enactment of this Act. 
Æ 
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