California: Background Check Requirement for Gun Barrel Sales Takes Effect January 1, 2026

California’s narrowing of gun barrel sales to licensed dealers only and background check requirement for said sales takes effect January 1, 2026.

Breitbart News reported that Gov. Gavin Newsom (D) signed the gun barrel controls on October 10, 2025, noting that the new law “will require all gun barrel sales to be conducted by licensed firearms dealers, mandating that said dealers conduct an ‘eligibility check’ before selling a barrel.”

The language of the bill makes clear that a five dollar fee will be added to each barrel sale to cover the cost of the “eligibility check.”

California Attorney General Rob Bonta put out a press release noting that the gun barrel controls take effect January 1, 2026, noting that the new law updates the definitions of “Firearm Accessory” and “Firearm Manufacturing Machine.”

Moreover, the new controls include an “updated definition and cause of action for unlawful distribution of digital firearm manufacturing code to unlicensed individuals” and create a “new criminal offense and civil cause of action for facilitating, or causing another person to engage in, the unlawful manufacture of firearms.”

If a barrel is purchased online, the new law requires that the “seller…ship the barrel to a licensed firearms dealer in California to complete the in-person transaction and final delivery pursuant to section 33700 of the Penal Code (codified by SB 704).”

California has more gun control than any other state in the Union, yet the FBI noted that California led the nation in “active shooter incidents” 2020-2024.