Michigan 2025-2026 Regular Session Status: Passed Senate 1 D cosponsors

SB 331 — Weapons: firearms; requirement for all firearm components to contain serial numbers; provide for. Amends 1927 PA 372 (MCL 28.421 - 28.435) by adding sec. 14c.

Last action — referred to Committee on Government Operations

  1. ✓
    Introduced
  2. ✓
    In Committee
  3. 3
    Passed Senate
  4. 4
    Passed House
  5. 5
    To Executive
  6. 6
    Enacted

This bill has passed the Senate. Introduced June 25, 2025. It now moves to the second chamber.

Next likely step: consideration and a floor vote in the House.

Odds of enactment

Moderate chance

Based on the sponsor, cosponsors, and committee posture, this bill has a moderate chance of becoming law.

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A statistical estimate from our own model of past outcomes — an insight, not a guarantee. Policymaking is volatile.

Prognosis

Advancing 48% · moderate confidence

  • Passed Senate

    Current position in the legislative process.

  • 1 sponsor

    1 primary, 0 co-sponsors signed on.

  • Single-party support

    Sponsorship is currently within one party (1 D).

  • Cleared a recorded vote

    Passed 2 recorded votes so far.

Based on stage, sponsorship breadth, committee status, recorded votes, and cross-state momentum — a description of the observable signals, not a prediction.

Summary

Weapons: firearms; requirement for all firearm components to contain serial numbers; provide for. Amends 1927 PA 372 (MCL 28.421 - 28.435) by adding sec. 14c.

Bill Text

What changed in the latest version

10 added · 9 removed

Plain-language change summary

The amendment to Bill SB 331 includes the addition of 10 lines that clarify specific provisions of the bill while removing 9 lines that were previously part of the text. These changes are important because they help to streamline the legislation, making it clearer and more focused on its intended objectives. By removing outdated or redundant language, the bill aims to enhance understanding and implementation, ensuring it effectively serves its purpose.

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SENATE BILL NO.
SB-331, As Passed Senate, June 25, 2025 SENATE BILL NO.
and to repeal all acts KHS S01319'25_SB0331_INTR_1 of201q and parts of acts inconsistent with this act," (MCL 28.421 to 28.435) by adding section 14c.
and to repeal all acts KHS S01319'25_SB331_APS_1 8gxqp4 and parts of acts inconsistent with this act," (MCL 28.421 to 28.435) by adding section 14c.
(ii) The person knowingly caused the firearm to be manufactured or assembled by another person that does not have a license to manufacture firearms unless that firearm has been imprinted with a KHS S01319'25_SB0331_INTR_1 of201q 1 valid serial number in accordance with subsection (5).
(ii) The person knowingly caused the firearm to be manufactured or assembled by another person that does not have a license to manufacture firearms unless that firearm has been imprinted with a KHS S01319'25_SB331_APS_1 8gxqp4 1 valid serial number in accordance with subsection (5).
(3) A person that manufactures or assembles a firearm or completed or unfinished frame or receiver in this state and who does not have a license to manufacture firearms shall, not later than 10 days after manufacturing or assembling the firearm or frame KHS S01319'25_SB0331_INTR_1 of201q 1 or receiver, have the firearm or completed or unfinished frame or receiver imprinted with a valid serial number in accordance with subsection (5), notify the director in a form and manner to be prescribed, and provide any identifying information concerning the firearm or frame or receiver and the owner of the firearm or frame or receiver requested by the director, including, but not limited to, the serial number of the firearm or frame or receiver.
(3) A person that manufactures or assembles a firearm or completed or unfinished frame or receiver in this state and who does not have a license to manufacture firearms shall, not later than 10 days after manufacturing or assembling the firearm or frame KHS S01319'25_SB331_APS_1 8gxqp4 1 or receiver, have the firearm or completed or unfinished frame or receiver imprinted with a valid serial number in accordance with subsection (5), notify the director in a form and manner to be prescribed, and provide any identifying information concerning the firearm or frame or receiver and the owner of the firearm or frame or receiver requested by the director, including, but not limited to, the serial number of the firearm or frame or receiver.
KHS S01319'25_SB0331_INTR_1 of201q 1 (i) The United States Armed Forces or the National Guard.
KHS S01319'25_SB331_APS_1 8gxqp4 1 (i) The United States Armed Forces or the National Guard.
(j) The possession or importation of a firearm or any KHS S01319'25_SB0331_INTR_1 of201q 1 completed or unfinished frame or receiver by an individual moving into this state who, not later than 90 days after moving into this state, causes the firearm or completed or unfinished frame or receiver to be imprinted with a valid serial number in accordance with subsection (5), removes the weapon from this state, or otherwise comes into compliance with this section.
(j) The possession or importation of a firearm or any KHS S01319'25_SB331_APS_1 8gxqp4 1 completed or unfinished frame or receiver by an individual moving into this state who, not later than 90 days after moving into this state, causes the firearm or completed or unfinished frame or receiver to be imprinted with a valid serial number in accordance with subsection (5), removes the weapon from this state, or otherwise comes into compliance with this section.
(a) For a first offense, a misdemeanor punishable by imprisonment for not more than 1 year, a fine of not more than KHS S01319'25_SB0331_INTR_1 of201q 1 $5,000.00, or both.
(a) For a first offense, a misdemeanor punishable by imprisonment for not more than 1 year, a fine of not more than KHS S01319'25_SB331_APS_1 8gxqp4 1 $5,000.00, or both.
(f) "Ghost gun precursor" means a frame, receiver, or unfinished frame or receiver, that does not have a valid serial KHS S01319'25_SB0331_INTR_1 of201q 1 number.
(f) "Ghost gun precursor" means a frame, receiver, or unfinished frame or receiver, that does not have a valid serial KHS S01319'25_SB331_APS_1 8gxqp4 1 number.
KHS S01319'25_SB0331_INTR_1 of201q 1 (m) "Undetectable firearm" means a firearm manufactured, assembled, or otherwise comprised entirely of nonmetal substances, if 1 of the following is true:
KHS S01319'25_SB331_APS_1 8gxqp4 1 (m) "Undetectable firearm" means a firearm manufactured, assembled, or otherwise comprised entirely of nonmetal substances, if 1 of the following is true:
Final Page KHS S01319'25_SB0331_INTR_1 of201q
Final Page KHS S01319'25_SB331_APS_1 8gxqp4
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Action History

  1. referred to Committee on Government Operations

Sponsors

Sponsorship breakdown

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1 sponsors · 0 co-sponsors · 146 not signed on · 17 voted No

Sponsors (1)

Co-sponsors (0)

None.

Not signed on (146)

146 members have not signed on to this bill.

Show all 146 →

"Not signed on" means a member has not sponsored or co-sponsored this bill — it does not imply opposition. Members flagged Voted No have a recorded No vote on this bill.

Whip count is in markup. Polling the chamber and every recorded vote this session. Only the first open is slow. It’s instant for you after this. Calling the roll · Tallying · Engrossing

Votes

PASSED

Passed 19 Yea · 17 Nay · 1 Other
Party YeaNayPresentNot Voting
Democrat 19000
Republican 01700
Unaffiliated 0001
Total 191701
% of votes cast 51%46%0%3%
How each member voted (37)
Member Party Vote
Outman — Not Voting
Darrin Camilleri Democrat Yea
Dayna Polehanki Democrat Yea
Erika Geiss Democrat Yea
Jeff Irwin Democrat Yea
Jeremy Moss Democrat Yea
John Cherry Democrat Yea
Kevin Hertel Democrat Yea
Mallory McMorrow Democrat Yea
Mary Cavanagh Democrat Yea
Paul Wojno Democrat Yea
Rosemary Bayer Democrat Yea
Sam Singh Democrat Yea
Sarah Anthony Democrat Yea
Sean McCann Democrat Yea
Stephanie Chang Democrat Yea
Sue Shink Democrat Yea
Sylvia Santana Democrat Yea
Veronica Klinefelt Democrat Yea
Winnie Brinks Democrat Yea
Aric Nesbitt Republican Nay
Dan Lauwers Republican Nay
Edward McBroom Republican Nay
Jim Runestad Republican Nay
John Damoose Republican Nay
Jon Bumstead Republican Nay
Jonathan Lindsey Republican Nay
Joseph Bellino Jr. Republican Nay
Kevin Daley Republican Nay
Lana Theis Republican Nay
Mark Huizenga Republican Nay
Michael Webber Republican Nay
Michele Hoitenga Republican Nay
Roger Hauck Republican Nay
Roger Victory Republican Nay
Ruth Johnson Republican Nay
Thomas Albert Republican Nay

Official roll call →

PASSED ROLL CALL # 175 YEAS 19 NAYS 17 EXCUSED 1 NOT VOTING 0

Passed 19 Yea · 17 Nay · 1 Other
Party YeaNayPresentNot Voting
Democrat 19000
Republican 01701
Total 191701
% of votes cast 51%46%0%3%
How each member voted (37)
Member Party Vote
Darrin Camilleri Democrat Yea
Dayna Polehanki Democrat Yea
Erika Geiss Democrat Yea
Jeff Irwin Democrat Yea
Jeremy Moss Democrat Yea
John Cherry Democrat Yea
Kevin Hertel Democrat Yea
Mallory McMorrow Democrat Yea
Mary Cavanagh Democrat Yea
Paul Wojno Democrat Yea
Rosemary Bayer Democrat Yea
Sam Singh Democrat Yea
Sarah Anthony Democrat Yea
Sean McCann Democrat Yea
Stephanie Chang Democrat Yea
Sue Shink Democrat Yea
Sylvia Santana Democrat Yea
Veronica Klinefelt Democrat Yea
Winnie Brinks Democrat Yea
Aric Nesbitt Republican Nay
Dan Lauwers Republican Nay
Edward McBroom Republican Nay
Jim Runestad Republican Nay
John Damoose Republican Nay
Jon Bumstead Republican Nay
Jonathan Lindsey Republican Nay
Joseph Bellino Jr. Republican Nay
Kevin Daley Republican Nay
Lana Theis Republican Nay
Mark Huizenga Republican Nay
Michael Webber Republican Nay
Michele Hoitenga Republican Nay
Rick Outman Republican Not Voting
Roger Hauck Republican Nay
Roger Victory Republican Nay
Ruth Johnson Republican Nay
Thomas Albert Republican Nay

Official roll call →

Subjects

public-safety civil-rights
Cross-referencing the record. Reading this bill against every other bill in the corpus by meaning, not keywords. Only the first open is slow. It’s instant for you after this. Matching · Ranking · Engrossing

Frequently asked questions

What does SB 331 do?
Weapons: firearms; requirement for all firearm components to contain serial numbers; provide for. Amends 1927 PA 372 (MCL 28.421 - 28.435) by adding sec. 14c.
Who sponsors SB 331?
SB 331 is sponsored by Mallory McMorrow (Democrat).
What is the current status of SB 331?
This bill has passed the Senate. Introduced June 25, 2025. It now moves to the second chamber.
Where can I track SB 331?
Track SB 331 free on One Click Politics — get push/email alerts when it moves.

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