SEC. 2. BUMP-STOCK-TYPE DEVICES TREATED AS MA-
CHINEGUNS. 
(a) IN GENERAL.—Section 921(a)(23) of title 18, 
United States Code, is amended— 
(1) by inserting ‘‘(A)’’ before ‘‘The’’; and 
(2) by adding at the end the following: 
‘‘(B) In such section 5845(b) as applied to this chap-
ter— 
‘‘(i) the term ‘automatically’ as it modifies 
‘shoots, is designed to shoot, or can be readily re-
stored to shoot,’ means functioning as the result of 
a self-acting or self-regulating mechanism that al-
lows the firing of multiple rounds through a single 
function of the trigger; 
‘‘(ii) the term ‘single function of the trigger’ 
means a single pull of the trigger and analogous mo-
tions; and 
‘‘(iii) the term ‘machinegun’ includes a bump- 
stock-type device.’’. 
(b) DEFINITIONS.—Section 921(a) of such title is 
amended by inserting after paragraph (29) the following: 
‘‘(30) 
BUMP-STOCK-TYPE
DEVICE.—The 
term 
‘bump-stock-type device’ means a device that allows a 
semiautomatic firearm to shoot more than one shot with 
a single pull of the trigger by harnessing the recoil energy 
of the semiautomatic firearm to which it is affixed so that 
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the trigger resets and continues firing without additional 
physical manipulation of the trigger by the shooter. 
‘‘(31) SEMIAUTOMATIC FIREARM.—The term ‘semi-
automatic firearm’ means any repeating firearm that— 
‘‘(A) utilizes a portion of the energy of a firing 
cartridge to extract the fired cartridge case and 
chamber the next round; and 
‘‘(B) requires a separate function of the trigger 
to fire each cartridge.’’. 
SEC. 3. BAN ON POSSESSION OR TRANSFER OF ACCELERA-
TION DEVICE OR BINARY-TRIGGER-TYPE DE-
VICE. 
(a) IN GENERAL.—Section 922 of title 18, United 
States Code, is amended by adding at the end the fol-
lowing: 
‘‘(aa)(1) It shall be unlawful for any person, in or 
affecting interstate or foreign commerce, to possess or 
transfer an acceleration device or a binary-trigger-type de-
vice. 
‘‘(2) Paragraph (1) shall not apply to— 
‘‘(A) the otherwise lawful possession of such a 
device before the date that is 90 days after the date 
this subsection takes effect, if the device is destroyed 
or disposed of within that 90-day period; or 
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‘‘(B) the possession of such a device by or for, 
or the transfer of a device for or to, the United 
States, a department or agency of the United States, 
a State, or a department, agency, or political sub-
division of a State, for the purposes of testing or ex-
perimentation authorized by the Attorney General.’’. 
(b) DEFINITIONS.—Section 921(a) of such title is 
amended by adding at the end the following: 
‘‘(36) The term ‘acceleration device’ means any part, 
combination of parts, component, device, attachment, or 
accessory that is designed and functions to accelerate the 
rate of fire of a semiautomatic firearm but not convert 
the semiautomatic firearm into a machinegun. 
‘‘(37) The term ‘binary-trigger-type device’ means a 
device that allows a semiautomatic firearm to fire more 
than one cartridge with a single pull and release of the 
trigger if— 
‘‘(A) the device treats the pull and release of 
the trigger as separate functions to fire a cartridge; 
and 
‘‘(B) each function results in at least one fired 
cartridge.’’. 
(c) PENALTIES.—Section 924(a)(2) of such title is 
amended by striking ‘‘or (o)’’ and inserting ‘‘(o), or (aa).’’ 
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SEC. 4. SENTENCING GUIDELINES. 
Pursuant to its authority under section 924 of title 
28, United States Code, and in accordance with this sec-
tion, the United States Sentencing Commission shall 
amend and review the Federal sentencing guidelines and 
policy statements to ensure that the guidelines provide for 
a penalty enhancement of not less than 2 offense levels 
for a violation of section 922(aa) of title 18 of such Code, 
and for a violation of section 922(o) of such title 18 con-
sisting of possession of a bump-stock-type device (as de-
fined in section 921(a)(30) of such title 18) if the device 
that is the subject of the violation has been— 
(1) used, carried, or possessed during or in re-
lation to a crime of violence or drug trafficking 
crime (as such terms are defined in section 
924(c)(3) of such title 18); or 
(2) smuggled unlawfully into or from the 
United States. 
Æ 
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