California would be the first state to require that every cartridge fired from a semiautomatic handgun be stamped with an identifying mark, under a bill that has now cleared both chambers of the Legislature.
The Senate sent the bill back to the Assembly for a final vote on amendments.
Governor Schwarzenegger isn't saying if he will sign the bill.
The measure would require that - starting in 2010 every semiautomatic handgun sold in California would have to automatically "microstamp" each bullet cartridge in two locations.
The stamping would identify the gun's make, model and serial number.
The bill would not affect revolvers, rifles or shotguns.
But supporters say semiautomatics are the weapon used in a majority of homicides committed with firearms.