They've tried this before under Obama, it won't go anywhere. IIRC California tried passing a law requiring all new firearms sold in the state to utilize micro-stamping technology to imprint the serial number on fired rounds via the firing pin so spent casings at a crime scene could easily be traced back to the firing weapon, but the courts shot it down as it placed undue financial burden on manufacturers as the technology was still in it's infancy and extremely expensive to implement in a mass production environment. When that failed they tried passing a law requiring all ammunition sold in the state to be micro-stamped with a serial number or something to that effect, which again was shot down by the courts for the same reason.
They know it won't fly, but it's a means to appease their base by making it look like they're trying to do something.
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