California lawmakers approved Assembly Bill 2047 on May 26, a legislative move aimed at curbing the proliferation of untraceable 3D-printed firearms, commonly referred to as “ghost guns.” The bill mandates that all 3D printer manufacturers embed a “firearm blueprint detection algorithm” into their hardware by July 2028. Printers failing to support this integrated detection technology would be prohibited from sale within the state.
The legislation now advances to the California State Senate. If it clears the Senate, the bill will move to the desk of Governor Gavin Newsom, who retains the authority to either sign the measure into law or issue a veto. The proposal has sparked significant pushback from technologists and privacy advocates who question the feasibility of the mandate.
The California Department of Justice, alongside other state agencies, is tasked with developing and publishing written guidance on performance standards by January 2028. While the specific nature of these algorithms remains undefined, the bill establishes two primary performance requirements: the software must block firearm components with a high degree of reliability and must be robust enough to resist circumvention by technically skilled users.
According to the legislation, the standards will not mandate perfect efficacy. Instead, the state will allow for “an acceptably low level of evasion” against a bank of identified design files. Manufacturers are expected to integrate this detection capability either directly into the printer's firmware or through pre-print splicer software.
Lawmakers introduced last-hour amendments to the bill in an attempt to address privacy concerns raised by the technology sector. Despite these adjustments, broad skepticism remains regarding the practical implementation of the requirements. Critics argue that the mandate could lead to increased government surveillance and technical hurdles for legitimate 3D printing applications.
The bill outlines a strict timeline for compliance. By January 2028, the state must release official guidance on performance standards. Following this, manufacturers will be required to ensure their equipment meets the state’s criteria to remain eligible for sale in the California market. The legislation represents a significant effort by the state to regulate the intersection of personal manufacturing technology and firearm accessibility.
