![](http://www.alamy.com/thumbs/6/4D4F4305-00F2-46F9-A37B-1EC26BC26171/2ACF6EH.jpg)
Forensic ballistics test. 3D model of the mark left by a gun's firing pin on a bullet cartridge. The scale shows this mark is millimetres across.
Forensic ballistics test. 3D model of the mark left by a gun's firing pin on a bullet cartridge. The scale shows this mark is millimetres across. The cartridge held a bullet, but was ejected from a gun as the bullet was fired. Unique markings (such as the indentation shown here) are made as the firing pin of a gun hits the cartridge and as the cartridge recoils from the bullet. The markings can be analysed and compared to markings on cartridges test-fired from guns suspected of being used in crimes. If they match, then that gun was used at the crime scene where the cartridge was found.
Size: 5197px × 3425px
Photo credit: © PATRICK LANDMANN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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