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AB-2047 • 2026

Firearms: 3-dimensional printing blocking technology.

Firearms: 3-dimensional printing blocking technology.

Crime Education Firearms Technology
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Bauer-Kahan
Last action
2026-04-15
Official status
From committee: Do pass and re-refer to Com. on APPR. (Ayes 9. Noes 3.) (April 14). Re-referred to Com. on APPR.
Effective date
Not listed

Plain English Breakdown

The bill summary and digest do not provide specific details on penalties or enforcement mechanisms.

Blocking Technology for 3D Printed Firearms

AB-2047 requires the Department of Justice to investigate and set standards for technology that blocks 3-dimensional printers from making firearms, and it bans selling or transferring unapproved 3D printers.

What This Bill Does

  • Requires the Department of Justice to investigate known firearm blueprint design files and existing detection algorithms.
  • Publishes performance standards for creating firearm blueprint detection algorithms by July 1, 2027.
  • Begins issuing certifications for compliant detection algorithms starting January 1, 2028.
  • Requiress manufacturers to submit attestations confirming their printers are equipped with certified blocking technology by July 1, 2028.
  • Publishes a list of compliant printer models on the department's website starting September 1, 2028.

Who It Names or Affects

  • Manufacturers and sellers of 3-dimensional printers in California
  • The Department of Justice or other relevant state agencies

Terms To Know

Firearm blueprint detection algorithm
A computer program that can identify firearm designs within digital files.
Certificate of compliance verification
An official document confirming a printer model meets the required standards for blocking technology.

Limits and Unknowns

  • The bill does not specify what happens if a manufacturer fails to comply with certification requirements.
  • It is unclear how enforcement will be carried out and what penalties will apply.
  • There are no details on how the public can access or use the published guidance.

Bill History

  1. 2026-04-15 California Legislative Information

    From committee: Do pass and re-refer to Com. on APPR. (Ayes 9. Noes 3.) (April 14). Re-referred to Com. on APPR.

  2. 2026-03-25 California Legislative Information

    From committee: Do pass and re-refer to Com. on JUD. (Ayes 6. Noes 0.) (March 24). Re-referred to Com. on JUD.

  3. 2026-03-09 California Legislative Information

    Referred to Coms. on PUB. S. and JUD.

  4. 2026-02-18 California Legislative Information

    From printer. May be heard in committee March 20.

  5. 2026-02-17 California Legislative Information

    Read first time. To print.

Official Summary Text

AB 2047, as introduced, Bauer-Kahan.
Firearms: 3-dimensional printing blocking technology.
Existing law makes it a crime to knowingly or willfully cause another person to engage in the unlawful manufacture of firearms or knowingly or willfully aiding, abetting, prompting, or facilitating the unlawful manufacture of firearms, including the manufacture of assault weapons or .50 BMG rifles or the manufacture of any firearm using a 3-dimensional printer, as specified.
This bill would require the Department of Justice or other relevant state agency to engage in an investigation of known firearm blueprint design files and existing firearm blueprint detection algorithms, as defined. The bill would require, on or before July 1, 2027, the department or other relevant state agency to publish written guidance on performance standards for persons or entities engaged in the creation of firearm blueprint detection algorithm to be certified for use by
3-dimensional printer manufacturers, as specified. The bill would require the department or other relevant state agency that prepared the written guidance on performance standards to accept applications for certification of firearms blueprint detection algorithms and begin issuing certifications of algorithms that meet or exceed the performance standards on or before January 1, 2028, and would specify the grounds for revocation of certification pursuant to these provisions. The bill would require the department or other relevant state agency to publish written guidance on how to equip 3-dimensional printers with firearm blocking technology, as defined, and would require the performance standards to be publicly available on the department or other relevant state agency’s website.
This bill would require, on or before July 1, 2028, any business that produces or manufactures 3-dimensional printers for sale or transfer in California to submit to the department an
attestation for each make and model of printer they intend to make available for sale or transfer in California, confirming, among other things, that the manufacturer has equipped that make and model with a certified firearm blueprint detection algorithm. If the department verifies a printer make and model is properly equipped, the bill would require the department to issue a notice of compliance, as specified. The bill would require, on or before September 1, 2028, the department to publish a list of all the makes and models of 3-dimensional printers whose manufacturers have submitted complete self-attestations and would require the department to update the list no less frequently than on a quarterly basis and to make the list available on the department’s internet website. The bill, beginning on March 1, 2029, would prohibit the sale or transfer of 3-dimensional printers that are not equipped with firearm blocking technology and that are not listed on the department’s list of manufacturers with a
certificate of compliance verification, except as specified. The bill would authorize a civil action to be brought against a person who sells, offers to sell, or transfers a printer without the firearm blocking technology.
This bill would also make it a crime to knowingly disable, deactivate, uninstall, or otherwise circumvent any firearm blocking technology installed in a 3-dimensional printer with intent to manufacture firearms or to distribute, sell, or transfer for consideration in California one or more modified versions of a 3-dimensional printer identified on the Department of Justice’s list of 3-dimensional printers eligible for sale in California. By creating a new crime, this bill would impose a state-mandated local program.
This bill would make these provisions severable.
The California Constitution requires the state to reimburse local agencies and
school districts for certain costs mandated by the state. Statutory provisions establish procedures for making that reimbursement.
This bill would provide that no reimbursement is required by this act for a specified reason.

Current Bill Text

Read the full stored bill text
Download Bill PDF