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| | Firearms and Toolmarks in the FBI Laboratory, Part 1, by Schehl (Forensic Science Communications, April 2000) |
 | | Forensic firearms examinations are based on firearms identification, which involves the identification of a bullet, cartridge case, or other ammunition component as having been fired by or in a particular firearm. |
 | | Fully automatic firearms, high caliber firearms, and shotguns, which cannot be discharged into the water tank, are tested on the Firearms-Toolmarks Unit's indoor range or on outdoor firearms ranges at the FBI Academy in Quantico, Virginia. |
 | | In firearms identification, class characteristics include the number and direction of a barrel's rifling (e.g., four grooves, right twist or six grooves, left twist), caliber or gauge, and the width of lands and grooves. |
| www.fbi.gov /hq/lab/fsc/backissu/april2000/schehl1.htm (1189 words) |
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