California lawmakers took a bold step last week. The Assembly approved AB 2047, known as the California Firearm Printing Prevention Act. The measure targets the sale of consumer 3D printers. It demands they ship with built-in technology to detect and stop attempts to produce firearm parts. Passed on May 26 by a 58-19 vote, the bill now advances to the state Senate. If it clears that hurdle and gains Gov. Gavin Newsom’s signature, manufacturers face strict deadlines. They must integrate so-called firearm blocking technology by 2028. Noncompliant models become unsellable in the state starting March 2029. Retailers risk $25,000 civil penalties for violations. Upstream Prevention Meets Technical Reality The legislation builds on existing rules that already ban unlicensed firearm manufacturing, including via 3D printing. Yet supporters argue a gap persists. Ghost guns — unserialized, untraceable firearms often assembled from printed components or kits — have surged in crime data.…