Senate Bill 704, introduced in February 2025 and amended in March 2025, proposes changes to California's Penal Code concerning firearms. Specifically, the bill focuses on firearm barrels, defining them and proposing that sales and transfers of these barrels be conducted in person through a licensed firearms dealer. This process would require the dealer to perform a background check on the buyer and record specific transaction details for submission to the Department of Justice, with violations classified as a misdemeanor. Additionally, the bill makes technical, non-substantive changes to existing laws regarding ammunition sales that require transactions to be processed through licensed vendors.