NIBIN, short for National Integrated Ballistic Information Network, is being used across the country. There are some limitations, but the evidence shows it's working.

How shell casings are being analyzed to help prevent shootings in DetroitPublished: February 5, 2020, 5:54 pmEvery time a gun is fired, there’s one key piece of evidence that could help police identify the shooter. When guns are fired, they leave a signature mark on the shell casings, and a national database of those marks is helping Detroit police make arrests.