Taking a closer look

[H&R Glock]

Gunny, does the extractor also leave identifiable tool marks on the brass?

 

[Odd Job]

And the breech face...

 

[GunnyUSMC]

Gunny, does the extractor also leave identifiable tool marks on the brass?

Yes the extractor does. The ejector, chamber, breach face and firing pin aperture also leaves marks.

 

[JR24]

Probably doesn't come up in crime all that often, but I'd wager my oft reloaded and shot in many guns range brass would give a tech fits, other than the primer of course.

 

[sota]

Here is another one. Can anyone guess who it is? Oh! It from a 7.62x39 cartridge case.
View attachment 832011

 

[H&R Glock]

I can guess that a computer system is used to scan, catalogue, and compare all the data from brass and bullets. Why? --- there seem to be thousands of data points to check and compare. More so than the human eye can sift through in a reasonable amount of study time. Computer scanning also is the basis of a "library" of stored crime information which can be shared over the internet among PD's and the Feds. You can also amuse yourself with "Primer Pictures" if you have the time.

 

[Riomouse911]

I thought the first primer had “pin-wipe” from opening prematurely...

Then the picture looked to me like a baboon rather than a dog... but it is animal-looking for sure!

Cool images .
Stay safe!

 

[CapnMac]

All look like over-enlarged prints osonograms by excited new parents--which would be my failure of imagination.