Weird Mark On 5.56 Case

[arrowshooter]

Something new to converse:


This case is Lake City 5.56 that I gleaned out due to this weird marking I have never seen before. At first I thought it was the brass hanging on for dear life not wanting to separate, but when I cut it open all I saw was the indentation from the outside. It almost looks like a roll crimp used on pistol rounds to prevent bullet set-back, but then my mind ran with it and now it's a mark left from being in a mini-gun belt . Any wisdom?

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[Akichita]

Bruh thats weird

 

[ilikegunspdx]

Something new to converse:


This case is Lake City 5.56 that I gleaned out due to this weird marking I have never seen before. At first I thought it was the brass hanging on for dear life not wanting to separate, but when I cut it open all I saw was the indentation from the outside. It almost looks like a roll crimp used on pistol rounds to prevent bullet set-back, but then my mind ran with it and now it's a mark left from being in a mini-gun belt . Any wisdom?

View attachment 1949375View attachment 1949376

Does it exist on unfired rounds?

 

[arrowshooter]

Does it exist on unfired rounds?

Part of bit of once fired stash I was fortunate to come across.

 

[JuglansRegia]

Could be from the chamber of the rifle it was fired in

 

[400Whelen]

Maybe not a Mini gun but possibly fired in a M-249 SAW.

I never inspected cases fired from a SAW. Just policed them up and threw them into the ammo cans.

400 Whelen

Ed