How can bullets be individualized to a gun

Measuring the number and width of these gross impressions can help firearms examiners narrow the range of possible weapons to a particular class of firearm. While general characteristics can lead investigators to conclude that the bullet or cartridge was fired from a particular class of firearm, such as a.

These individual characteristics can be marks produced by random imperfections during manufacturing or irregularities caused by use, corrosion or damage. Comparing groove impressions on a bullet recovered from a crime scene left to a bullet fired from a.

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Individual characteristics When a gun is fired, small imperfections inside the barrel leave a unique pattern of marks on the bullet. Two bullets fired from the same gun will bear identical individual characteristics. An examiner needs to understand firearm types, as well as the actions employed by firearm manufacturers in producing these firearms.

A firearm examiner must be able to describe to a jury how a particular firearm functions and why a particular firearm may have malfunctioned. This skill is learned through extensive training in the section, by touring firearm manufacturing facilities, and by attending armorer courses sponsored by various firearm manufacturers.

IBIS is a computer-based system for comparing digital images of cartridge cases found at crime scenes against digital images of fired casings found at other crime scenes and test fired casings from weapons. This allows the firearms examiners to compare images entered to images in any IBIS system across the country.