AB2047 (2026): Mandating 3D Printing Blocking Technology for Firearms

What the Bill Would Do

Assembly Bill 2047 would require 3D printers sold in California to incorporate technology that blocks or prevents the printing of firearm components^[1]. The bill represents a novel regulatory approach to the ghost gun problem — rather than targeting the finished product (as existing law does under PC 29180-29184, which requires serialization and background checks for self-manufactured firearms), AB2047 would target the manufacturing tool itself.

California has been at the forefront of ghost gun regulation. AB1263 (2025, now law) strengthened the serialization requirements originally enacted by AB857 (2016). Despite these laws, the number of unserialized firearms recovered by law enforcement has continued to increase, prompting legislators to explore upstream solutions like AB2047^[2].

Current Status

AB2047 was referred to the Committees on Public Safety and Judiciary on March 9, 2026. The dual referral to both Public Safety and Judiciary signals that the bill raises both public safety policy questions and significant legal and constitutional questions.

What to Watch

This bill faces extraordinary technical and legal challenges. Technically, no commercially viable "blocking technology" currently exists that can reliably identify and prevent the printing of all possible firearm component geometries while allowing legitimate printing. Legally, the bill implicates First Amendment questions (3D printing files as protected speech, per Defense Distributed v. U.S. Department of State), Commerce Clause issues (regulating manufacturers outside California), and preemption concerns. The 3D printing industry will likely mount significant opposition. This bill is more likely to generate policy debate than to become law in its current form, but it signals the direction of California's approach to emerging manufacturing technologies.