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A barrel will produce individual markings in addition to a bullet's land and groove impressions as the bullet passes through, and it is these unique markings that an examiner evaluates to determine whether a given bullet was fired from a particular firearm.

Because receiver blanks do not have markings or serial numbers, when firearms made from such receiver blanks are found at a crime scene, it is usually not possible to trace the firearm or determine its history, which hinders crime gun investigations and jeopardizes public safety.

Usually, yes. There is a pattern inside the barrel, like a very stretched spiral. It makes the bullet spin, which is good for trajectory accuracy. The stripes and ridges that make up this pattern leaves an imprint in the bullet, which is considered unique for each gun(barrel).

When the authorities are trying to solve a crime involving a firearm, they can sometimes trace a bullet that was fired back to a specific gun. They can determine that that was the exact gun used in the event.

In order to trace a bullet back to a particular weapon there has to be a sample of the casing on register as well as a means of searching that register based on case marks. More commonly a suspect weapon is eliminated or included for further investigation by such means. Weapons do leave distinctive marks on casings.

When the authorities are trying to solve a crime involving a firearm, they can sometimes trace a bullet that was fired back to a specific gun. They can determine that that was the exact gun used in the event.

A barrel will produce individual markings in addition to a bullet's land and groove impressions as the bullet passes through, and it is these unique markings that an examiner evaluates to determine whether a given bullet was fired from a particular firearm.