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In addition to recording the markings from guns used in crimes, the system is designed to record markings from the test firing of every new gun. Currently, manufacturer participation is voluntary and only Glock USA, is contributing information to the database. If the database does eventually contain the majority of firearms in the US, it would be possible for the police to start the trace process with nothing more than a bullet or a casing left at a crime scene.
Why did I get two fired brass casings with my Glock?
Some states now require that firearms manufacturers provide fired casings with every new handgun. The brass will be collected by the dealer and given to the state to be entered into an information database. If you are not in one of these states the dealer usually gives just gives them to the customer.