ALBANY - (AP) - Mayors, police chiefs and prosecutors arelobbying for legislation requiring semiautomatic handguns made andsold in New York to "microstamp" unique identifying informationon spent bullet casings.

New York City Mayor Michael Bloomberg, surrounded by other cityofficials, says semiautomatics are the guns most used in crimes,with casings sometimes the only evidence leading back to a weapon.

Microstamping leaves the identification marks when a shot isfired. Bloomberg says it would add about $12 to the $450 averagegun price.

The National Shooting Sports Foundation says the technology isflawed, easily thwarted by criminals, and adds to legal owners'costs.

The Senate plans to vote on the measure Tuesday. The Assemblyhas approved a similar bill, which would take effect in 2012.