The answer from u/sudoku7 on microstamping is the right one. Think of it like the gun stamping on the bullet: “I am the weapon that fired this bullet”.
What you might see in shows like CSI (I am starting to feel old here) where they match rifling patterns on bullets to a specific weapon, but that is far from being a foolproof method, it has its limits. In some cases, it can identify from which weapon a bullet was fired and in others, not so much.
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