Social Studies, 08.04.2020 00:50, Jrstx333

Within a gun's barrel, lands and grooves cause a bullet to spiral when exiting the barrel of the gun, much in the same way a football spirals when thrown. This pattern left on the bullet is unique to the firearm used to shoot the bullet.

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Within a gun's barrel, lands and grooves cause a bullet to spiral when exiting the barrel of the gun...