Is every new gun made test fired first and the bullet sent to the

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Why is it possible to identify the gun where a bullet comes from, looking at its groves, if all guns of a given model are made in the same machine? - Quora

Is every new gun made test fired first and the bullet sent to the

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What can a forensics ballistics expert learn from a fired bullet without a casing? - Quora

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In the US, why isn't a ballistic test conducted on each firearm before it is sold? Wouldn't this help solve crimes where the firearm is not recovered? - Quora