On July 1, 2022, California Penal Code section 31910 was revised. The change required semiautomatic pistols sold in California to have microstamping technology.
A microstamp acts like a fingerprint in identifying ammunition cartridges and the gun from which it was fired. The firing pin imposes an identifying stamp on the round's primer as it’s discharged.
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And that'll be the end of new semi-auto gun sales in California seeing as the technology doesn't exist yet, as evidenced by the next paragraph which includes 'Supporters hoped that this change in the penal code would encourage manufacturers to employ the technology in their firearm products.'
