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Title: Firing Pin
Description: NIST engineer Alan Zheng points to the firing pin impression, one of three marks impressed on the surface of a cartridge case when a gun is fired. The marks, also known as signatures, can act like fingerprints to identify a specific firearm and are key elements in NIST's standard casing, Standard Reference Material 2461.


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Subjects (names): Zheng, Alan
Type: Photo/Color
Source: National Institute of Standards and Technology
Credit Line as it should
appear in print:
Credit: NIST
AV Number: 12PML034
Date Created: 2012
Date Entered: 10/2/2012

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