Striations on a bullet are caused by the bullet moving through the barrel of the gun. Bullets fired from different guns leave different patterns.

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Quizplus · Accepted Answer

Striations on a bullet are unique marks left as the bullet moves through the barrel of a gun, caused by the lands and grooves inside the barrel. These patterns can vary between different firearms, making them useful for forensic ballistics analysis.

Striations on a Bullet Are Caused by the Bullet Moving