S. 1909Senate118th Congress (2023-2025)In Committee

BUMP Act of 2023

Introduced June 8, 2023

AI-Generated Summary

Updated January 20, 2026 at 8:38 AM UTC

The BUMP Act of 2023 amends federal criminal law to ban the illegal modification of semiautomatic firearms that increase their rate of fire or make them function like machine guns. It defines “semiautomatic firearm,” makes it unlawful to import, sell, manufacture, transfer, receive, or possess such modifying devices, and requires owners of already‑modified guns to register them. The law also adds these modified firearms to the list of weapons regulated under the National Firearms Act. It applies to individuals and businesses dealing with firearms, with exemptions for government agencies.

Key Provisions

  • Adds a definition of “semiautomatic firearm” as a gun that uses cartridge energy to cycle, requires a separate trigger pull for each shot, and is not a machine gun.
  • Makes it illegal, after 120 days, to import, sell, manufacture, transfer, receive, or possess any device or part that, when attached to a semiautomatic firearm, materially increases its rate of fire or mimics a machine gun.
  • Prohibits possession of semiautomatic firearms that have been modified to increase rate of fire or act like a machine gun, unless the firearm was lawfully modified before the law took effect and is registered.
  • Requires owners of pre‑existing modified semiautomatic firearms to register them with the IRS under the National Firearms Act within 120 days.
  • Exempts the United States government, its agencies, and state or local governments from the prohibitions.
  • Amends the National Firearms Act to include modified semiautomatic firearms as a newly regulated category.

Legislative Activity

Stay on top of the latest movement without scrolling through every action

1 earlier action
SenateIntro Referral Latest Action

Read twice and referred to the Committee on the Judiciary.

June 8, 2023

View full timeline
SenateIntro Referral

Introduced in Senate

June 8, 2023

SenateIntro Referral

Read twice and referred to the Committee on the Judiciary.

June 8, 2023

Floor Debate

19 members

What members said about S. 1909 on the floor

9 Republicans10 Democrats
Thomas R. Carper
Sen. Thomas R. CarperD-DE · Jun 18, 2024

Mr. President, I ask to be recognized, and I am pleased to be here with you today. I rise today in strong support of critical bipartisan legislation that will come to the Senate floor--not later this…

Edward J. Markey
Sen. Edward J. MarkeyD-MA · Jun 18, 2024

Mr. President, I ask unanimous consent that the order for the quorum call be rescinded. Mr. President, I rise today to discuss S. 870. I am a passionately strong supporter of the effort to…

James Lankford
Sen. James LankfordR-OK · Jun 18, 2024

Mr. President, my guess is, if I went to every person in this room--every page, every person sitting in the Gallery, every Senator--and I pointed to this image and said, ``What do you see there?'' my…

Katie Boyd Britt
Sen. Katie Boyd BrittR-AL · Jun 18, 2024

Mr. President, as Americans, we believe that every person on the planet is created by their Creator with certain unalienable rights. Religious freedom is at the top of that list, and for me, I…

Martin Heinrich
Sen. Martin HeinrichD-NM · Jun 18, 2024

Mr. President, I want to begin today before we get to bump stocks by acknowledging the South Fork and Salt fires that have forced literally thousands from their homes in Lincoln County, NM, and the…

Show 8 more
Catherine Cortez Masto
Sen. Catherine Cortez MastoD-NV · Jun 18, 2024

Mr. President, I ask unanimous consent that the order for the quorum call be rescinded. Mr. President, I rise today to express my deep disappointment of what I just heard, unfortunately, from my…

Jerry Moran
Sen. Jerry MoranR-KS · Jun 18, 2024

Mr. President, 10 years ago, a wait-time scandal at the VA Medical Center in Phoenix, AZ, led to a nationwide access and accountability crisis for the VA healthcare system. Many of us responded to…

Maria Cantwell
Sen. Maria CantwellD-WA · Jun 18, 2024

Mr. President, I ask unanimous consent that the order for the quorum call be rescinded. Mr. President, today, the Committee on Commerce, Science, and Transportation was slated to consider the…

Charles E. Schumer
Sen. Charles E. SchumerD-NY · Jun 18, 2024

Mr. President, I ask unanimous consent that the order for the quorum call be rescinded. Mr. President, I am proud to come to the floor today to stand with my good friend and a great leader on this…

Pete Ricketts
Sen. Pete RickettsR-NE · Jun 18, 2024

Reserving the right to object. Welcome to another day of the Democratic summer of show votes. We need to be clear why the majority leader is holding this show vote. The Supreme Court made a decision…

Tina Smith
Sen. Tina SmithD-MN · Jun 18, 2024

Mr. President, reserving the right to object, and with respect for my colleague Senator Hyde-Smith with whom I serve on the Agriculture Committee, I fear this bill is another attempt to distract from…

Mazie K. Hirono
Sen. Mazie K. HironoD-HI · Jun 18, 2024

Mr. President, I rise today deeply concerned that the far-right majority on the Supreme Court is preparing to sow further chaos in our country. Any day now, the Court is expected to rule on two cases…

Shelley Moore Capito
Sen. Shelley Moore CapitoR-WV · Jun 18, 2024

Mr. President, I ask unanimous consent that the following Senators be allowed to speak prior to the scheduled rollcall vote: me for 5 minutes, Senator Peters for up to 5 minutes, and Leader Schumer…

Show 6 more
Susan M. Collins
Sen. Susan M. CollinsR-ME · Jun 18, 2024

Mr. President, I rise today to express my support for the Fire Grants and Safety Act, which is included in the bill we are considering today. I have co-led this bill with Senator Peters and fellow…

Cindy Hyde-Smith
Sen. Cindy Hyde-SmithR-MS · Jun 18, 2024

Mr. President, in a few moments, I would like to ask unanimous consent for the Senate to take up and pass legislation I have introduced to support genuine solutions to infertility and empower couples…

John Thune
Sen. John ThuneR-SD · Jun 18, 2024

Mr. President, in just a few minutes, I will ask for a unanimous consent to pass my Born-Alive Abortion Survivors Protection Act. This is a very simple bill, and it should be a noncontroversial one.…

Gary C. Peters
Sen. Gary C. PetersD-MI · Jun 18, 2024

Mr. President, soon, the Senate will have an opportunity to ensure that essential Federal resources remain available to fire departments all across our country. Every day, firefighters risk their…

John Cornyn
Sen. John CornynR-TX · Jun 18, 2024

Mr. President, I want to commend my friends and colleagues from Mississippi and South Dakota and Oklahoma for their leadership in protecting the lives of the unborn and to thank them for bringing us…

Laphonza R. Butler
Sen. Laphonza R. ButlerD-CA · Jun 18, 2024

Mr. President, reserving the right to object, I rise in opposition to the Born-Alive Abortion Survivors Protection Act. Despite what our Republican colleagues propose, the contents of this…

Bill Text

Latest available legislative text

Reading Mode
Latest
Introduced in SenateIssued June 8, 2023

II

118th CONGRESS

1st Session

S. 1909

IN THE SENATE OF THE UNITED STATES

June 8, 2023

Mr. Heinrich (for himself, Ms. Collins, and Ms. Cortez Masto) 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 the illegal modification of firearms, and for other purposes.

1.

Short title

This Act may be cited as the Banning Unlawful Machinegun Parts Act of 2023 or the BUMP Act of 2023.

2.

Prohibition

(a)

In general

Chapter 44 of title 18, United States Code, is amended—

(1)

in section 921(a), by inserting after paragraph (30) the following:

(31)

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; or

(ii)

approximates the action or rate of fire of a machinegun.

(2)

Except as provided in paragraph (3), not later than 120 days after the date of enactment of this subsection, any person who lawfully owns or possesses a semiautomatic firearm that was modified as described in paragraph (1)(C) before such date of enactment shall register the semiautomatic firearm in accordance with section 5841 of the Internal Revenue Code of 1986.

(3)

This subsection does not apply with respect to the importation for, manufacture for, sale to, transfer to, or possession by or under the authority of, the United States or any department or agency thereof or a State, or a department, agency, or political subdivision thereof.

(4)

Paragraph (1) shall not apply to any lawful transfer or possession of a semiautomatic firearm described in paragraph (1)(C) that—

(A)

was lawfully modified and possessed before the date of enactment of this subsection; and

(B)

is registered in accordance with paragraph (2).

; and

(3)

in section 924(a)(2), by striking , or (o) and inserting (o), or (v).

(b)

Amendment to the National Firearms Act

Section 5845(a) of the Internal Revenue Code of 1986 is amended by striking and (8) a destructive device and inserting (8) a destructive device; and (9) a semiautomatic firearm, as defined in section 921 of title 18, United States Code, that is modified as described in section 922(v)(1)(C) of such title.