Class characteristics of firearms and firearm evidence allow investigators to determine the manufacturer and the gun type.
The class characteristics of a bullet can enable a trained investigator to be able to know which gun fired the bullet and this will then lead them to the manufacturers of the bullet as well.
This is made even more accurate by other firearm evidence that is found by the investigators such as bullet casings. The reason being that various guns use different types of bullets and are made by different manufacturer.
Once investigators figure out the gun type and the manufacture, they can look up registration records to see who owned the weapon.
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