California Code, Penal Code - PEN § 27533

(a) Commencing on January 1, 2028, if the department has determined that microstamping components, microstamping-enabled semi-automatic firearms, or both microstamping components and microstamping-enabled firearms are available pursuant to subdivision (e) of Section 27532, it shall be unlawful for a firearms dealer licensed pursuant to Sections 26700 to 26915, inclusive, to sell, offer for sale, exchange, give, transfer, or deliver any semiautomatic pistol unless the pistol has been certified as a microstamping-enabled pistol as defined in Section 27531.  A dealer shall be in compliance with this section if the dealer relies in good faith on a written certification made by the pistol's manufacturer that the pistol is microstamping-enabled, on a written certification made by a gunsmith that serviced the pistol to install a microstamping component, or if the dealer has serviced the pistol to install a microstamping component certified by an entity licensed pursuant to subdivision (c) of Section 27532.

(b) The first violation for unlawful sale of a nonmicrostamping-enabled pistol pursuant to this section shall be punishable by a fine of not more than one thousand dollars ($1,000).

(c) The second violation for unlawful sale of a nonmicrostamping-enabled pistol pursuant to this section shall be punishable by a fine of not more than five thousand dollars ($5,000) and may result in the revocation of the dealer's license issued under Sections 26700 to 26915, inclusive.

(d) The third violation for unlawful sale of a nonmicrostamping-enabled pistol pursuant to this section is a misdemeanor and shall result in the revocation of the dealer's license issued under Sections 26700 to 26915, inclusive.

(e) This section shall not apply to any of the following: