What are striations of a gun?

Striations on a gun refer to the unique, microscopic markings left on a bullet or cartridge case as it is fired. These markings are created by the specific patterns of grooves and lands in the gun's barrel, which imprint the bullet as it travels through. Forensic experts use these striations in ballistic analysis to match a bullet to a specific firearm, aiding in criminal investigations. Each gun produces a distinct set of striations, making them useful for identification purposes.