Crimeatorium
Part 3: The State of Florida vs Laurie Shaver | The Murder of Michael Shaver
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And those direction, width, and number will differ between firearms. There are also individual characteristics that are transferred to a bullet during the firing process. These are called striations. They're resultant of the manufacturing process in that those helical grooves are cut by a tool into the barrel of a firearm. They're unique to that firearm.
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