What are striations in firearms identification?

What are striations in firearms identification?

• A. Coarse marks on the bullet.
• B. Fine lines found in the barrel that impart unique characteristics to bullets as they pass through.
• C. Marks on the trigger guard.
• D. Dimples on the bullet nose.

Answer: (B)

Striations are the fine, microscopic lines impressed on a bullet as it passes through a rifled barrel. The barrel’s lands and grooves twist the bullet and create thousands of tiny scratches and ridges on its surface, leaving a distinctive pattern. Because a specific barrel has unique wear, manufacturing imperfections, and overall condition, the striation pattern on a bullet becomes a fingerprint of that firearm. In forensic ballistics, examiners compare a questioned bullet to bullets fired from a suspected gun using a comparison microscope to see if the fine striation patterns align, which can indicate a common firearm. These marks are fine lines, not coarse scratches, and they aren’t marks on the trigger guard or dimples on the bullet nose, so those features wouldn’t provide the same firearm-specific information. The key idea is that the rifling inside the barrel leaves these tiny, individual lines that can be matched to a particular gun.

Striations are the fine, microscopic lines impressed on a bullet as it passes through a rifled barrel. The barrel’s lands and grooves twist the bullet and create thousands of tiny scratches and ridges on its surface, leaving a distinctive pattern. Because a specific barrel has unique wear, manufacturing imperfections, and overall condition, the striation pattern on a bullet becomes a fingerprint of that firearm. In forensic ballistics, examiners compare a questioned bullet to bullets fired from a suspected gun using a comparison microscope to see if the fine striation patterns align, which can indicate a common firearm. These marks are fine lines, not coarse scratches, and they aren’t marks on the trigger guard or dimples on the bullet nose, so those features wouldn’t provide the same firearm-specific information. The key idea is that the rifling inside the barrel leaves these tiny, individual lines that can be matched to a particular gun.