Microstamping Can Help Police Match Guns to Shell Casings, Study Finds

Photo by Michael Beddow, UC Davis: closeup of microstamp on shell casing

New technology currently being tested by the University of California at Davis could make it easier for police to identify the gun from which shells left at a crime scene have been fired. The technology, called microstamping, works by stamping each shell with an identifying mark unique to the gun from which it was fired. The recently concluded study found that microstamping is feasible, however it did not work equally well for all guns and ammunition in the pilot and wider testing should be done.

Microstamping technology uses a laser to cut a pattern or code into the head of a firing pin or another internal surface. The method is similar to that used to engrave codes on computer chips. When the trigger is pulled, the firing pin hits the cartridge case or primer and stamps the code onto it. In principle, the spent cartridge can then be matched to a specific gun.

In October 2007, Gov. Arnold Schwarzenegger signed into law AB 1471, requiring that all new models of semiautomatic pistols sold in California on or after Jan. 1, 2010, be engraved in two or more places with an identifying code that is transferred to the cartridge case on firing. Similar legislation has been proposed in other states and at the federal level.

In March 2008, a report from the National Research Council, part of the National Academies of Science, described microstamping as a "promising" approach and called for more in-depth studies on the durability of microstamped marks under different firing conditions.

"Our study confirms the NRC position that more research should be conducted on this technology," said Fred Tulleners, director of the forensic science graduate program at UC Davis. Tulleners is also a former director of the California Department of Justice crime labs in Sacramento and Santa Rosa.

If successfully implemented, microstamping would be one additional piece of evidence for investigators to link various shooting events, Tulleners said.

UC Davis graduate student Michael Beddow looked at the performance of microstamped marks in one location, the firing pin. He tested firing pins from six different brands of semi-automatic handguns, two semi-automatic rifles and a shotgun. The firing pins were engraved with three different types of code: a letter/number code on the face of the firing pin; a pattern of dots or gears around the pin; and a radial bar code down the side of the pin. The engraved firing pins were purchased from ID Dynamics of Londonderry, N.H.

To test the effects of repeated firing, Beddow fitted engraved firing pins into six Smith and Wesson .40-caliber handguns that were issued to California Highway Patrol cadets for use in weapons training.

After firing about 2,500 rounds, the letter/number codes on the face of the firing pins were still legible with some signs of wear. But the bar codes and dot codes around the edge of the pins were badly worn.

"They were hammered flat," Beddow said.

Tests on other guns, including .22-, .380- and .40-caliber handguns, two semi-automatic rifles and a pump-action shotgun, showed a wide range of results depending on the weapon, the ammunition used and the type of code examined. Generally, the letter/number codes on the face of the firing pin and the gear codes transferred well to cartridge cases, but the bar codes on the sides of the firing