SB 332 is sponsored by Habush Sinykin, Hesselbein, Dianne (Democrat), Johnson, LaTonya (Democrat), Larson, Chris (Democrat), Roys, Kelda (Democrat), Joers, Fitzgerald, Subeck, Hong, Andraca, Stubbs, Vining, Clancy, Arney, Bare, Brown, Cruz, DeSmidt, Emerson, Goodwin, Hysell, Haywood, Kirsch, Mayadev, Miresse, Moore Omokunde, Neubauer, Palmeri, Prado, Rivera-Wagner, Roe, Sheehan, Sinicki, Snodgrass, Stroud, Taylor, Tenorio, Udell, Dassler-Alfheim, Kristin (Democrat), Drake, Dora (Democrat), Keyeski, Sarah (Democrat), Ratcliff, Melissa (Democrat), Smith, Jeff (Democrat), Spreitzer, Mark (Democrat), and Carpenter, Tim (Democrat).

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Wisconsin 2025 Regular Session Status: Introduced 12 D cosponsors

SB 332 — Relating to: prohibition against undetectable firearms, possessing a frame or receiver of a firearm without a serial number, and providing a penalty.

Last action March 23, 2026 — Failed to pass pursuant to Senate Joint Resolution 1

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Introduced
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Passed Senate
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Passed Assembly
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To Executive
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Enacted

This bill has been introduced in the Senate. Introduced June 19, 2025. It must pass committee before a floor vote.

Next likely step: a committee referral and hearing.

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Where this bill stands today.

Odds of enactment

Low

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Summary

An Act to amend 939.6195 (1) (a) 1. and 941.291 (1) (b); to create 941.293 of the statutes;

Bill Text

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How this bill changes current law

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The bill introduces new prohibitions related to undetectable firearms and the possession of unmarked firearm frames or receivers, along with related penalties.

Wis. Stat. § 939.6195 (1) (a) 1.

~~A violation of s. 941.29.~~ → A violation of s. 941.29 or, 941.2905, or 941.293.

The definition of a firearm violation now includes additional offenses related to undetectable firearms.
Wis. Stat. § 941.291 (1) (b)

~~941.29, 941.2905,~~ → 941.29, 941.2905, 941.293,

The definition of violent felony now includes the new section related to undetectable firearms.
Wis. Stat. § 941.293

941.293 Undetectable firearms; serial numbers on firearm components. (1) In this section: (a) “Major component” means the barrel, the slide or cylinder, or the frame or receiver of a firearm. (b) “Undetectable firearm” means any of the following: 1. A firearm that, after the removal of grips, stocks, and magazines, is not detectable by a metal detector calibrated to detect a security exemplar, as defined in 18 USC 922 (p) (2) (C). 2. A firearm if any major component of it does not generate an image that accurately depicts the shape of the component when subject to inspection by security scanners, x-ray machines, or other security devices commonly used at airports. (2) (a) 1. Whoever sells, offers to sell, transfers, transports, manufactures, possesses, or goes armed with an undetectable firearm is guilty of a Class G felony. 2. Whoever sells, offers to sell, transfers, posts, provides to another, or possesses plans for manufacturing an undetectable firearm is guilty of a Class H felony. (b) Paragraph (a) does not apply to a person who is licensed by a state or the federal government to manufacture undetectable firearms while the person is on official duty. Paragraph (a) 1. does not apply to a law enforcement officer while on official duty or to armed forces or national guard personnel while on official duty. (3) (a) Whoever possesses a frame or a receiver of a firearm that is not attached to a firearm and that is not marked or engraved with a serial number is guilty of a Class I felony. (b) Paragraph (a) does not apply to a firearm frame or receiver manufactured before 1968, a person who is licensed by a state or the federal government to manufacture undetectable firearms while the person is on official duty, a law enforcement officer while on official duty, or armed forces or national guard personnel while on official duty.

This new section establishes prohibitions and penalties regarding undetectable firearms and unmarked firearm components.

Action History

March 23, 2026
Failed to pass pursuant to Senate Joint Resolution 1
January 09, 2026
Representative J. Jacobson added as a cosponsor
September 23, 2025
Representative McCarville added as a cosponsor
September 10, 2025
Representative Billings added as a cosponsor
June 19, 2025
Read first time and referred to Committee on Licensing, Regulatory Reform, State and Federal Affairs
June 19, 2025
Introduced by Senators Hesselbein, L. Johnson, Larson, Roys, Dassler-Alfheim, Drake, Habush Sinykin, Keyeski, Ratcliff, Smith, Spreitzer and Carpenter; cosponsored by Representatives Joers, Fitzgerald, Subeck, Hong, Andraca, Stubbs, Vining, Clancy, Arney, Bare, Brown, Cruz, DeSmidt, Emerson, Goodwin, Hysell, Haywood, Johnson, Kirsch, Mayadev, Miresse, Moore Omokunde, Neubauer, Palmeri, Prado, Rivera-Wagner, Roe, Sheehan, Sinicki, Snodgrass, Stroud, Taylor, Tenorio and Udell

Sponsorship breakdown

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1 sponsors · 45 co-sponsors · 86 not signed on

Sponsors (1)

Hesselbein, Dianne Democrat

Not signed on (86)

86 members have not signed on to this bill.

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"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

Subjects

public-safety

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Frequently asked questions

What does SB 332 do?: An Act to amend 939.6195 (1) (a) 1. and 941.291 (1) (b); to create 941.293 of the statutes;
Who sponsors SB 332?: SB 332 is sponsored by Habush Sinykin, Hesselbein, Dianne (Democrat), Johnson, LaTonya (Democrat), Larson, Chris (Democrat), Roys, Kelda (Democrat), Joers, Fitzgerald, Subeck, Hong, Andraca, Stubbs, Vining, Clancy, Arney, Bare, Brown, Cruz, DeSmidt, Emerson, Goodwin, Hysell, Haywood, Kirsch, Mayadev, Miresse, Moore Omokunde, Neubauer, Palmeri, Prado, Rivera-Wagner, Roe, Sheehan, Sinicki, Snodgrass, Stroud, Taylor, Tenorio, Udell, Dassler-Alfheim, Kristin (Democrat), Drake, Dora (Democrat), Keyeski, Sarah (Democrat), Ratcliff, Melissa (Democrat), Smith, Jeff (Democrat), Spreitzer, Mark (Democrat), and Carpenter, Tim (Democrat).
What is the current status of SB 332?: This bill has been introduced in the Senate. Introduced June 19, 2025. It must pass committee before a floor vote.
Where can I track SB 332?: Track SB 332 free on One Click Politics — get push/email alerts when it moves.

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At a glance

Identifier: SB 332
Jurisdiction: Wisconsin
Session: 2025 Regular Session
Type: Bill
Introduced: June 19, 2025
Status: Introduced
Prime sponsor: Hesselbein, Dianne

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Last checked for changes 3 months ago · updated continuously

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