Strange markings

IDPA Mike · Oct 23, 2011

I was at the range today and picked up some reloading brass.
I was sorting and found about 20/.223's with strange grease rmarks.
I was just wondering how the brass got marked up so bad.
Thanks, Mike

01SVTvert · Oct 23, 2011

Looks like the markings on a HK pistol from the gas retarded blowback system. Anyone know if they make the same system in rifle?

Marcus5aurelius · Oct 23, 2011

I've been wondering this same questions for some time now. I just assumed they were machine gunned and I toss them in the scrap bucket (because the brass itself is ridged). Can anyone confirm?

Supermoto · Oct 23, 2011

They are from a fluted chamber

atmay · Oct 23, 2011

01SVTvert said:
Looks like the markings on a HK pistol from the gas retarded blowback system. Anyone know if they make the same system in rifle?

Supermoto said:
They are from a fluted chamber

This.

I forget where I saw them, but someone with a Century CETME had brass that was actually scored/perforated/coming apart because of (poorly machined, out of spec) chamber flutes.

exo · Oct 23, 2011

What is a fluted chamber for?

mac1911 · Oct 24, 2011

keep from case geting stuck ? I see this around my range but mostly 762x54r

drgrant · Oct 24, 2011

01SVTvert said:
Looks like the markings on a HK pistol from the gas retarded blowback system. Anyone know if they make the same system in rifle?

Yes, HK 9X rifles do the same thing. It was probably an HK93 clone or one of its siblings.

-Mike

DukeInFlorida · Oct 24, 2011

See a lot of .308 Win that way also.

widnerkj · Oct 27, 2011

absolutly a HK or clone. 93 if it's .223. They do kick the crap out of the brass, and toss it pretty far as well.

ARV · Oct 28, 2011

exodious said:
What is a fluted chamber for?

Makes it easier for the casing to be extracted. Those rifles are roller delayed blowback.

55_grain · Oct 30, 2011

ARV said:
Makes it easier for the casing to be extracted. Those rifles are roller delayed blowback.

This. 90% of the markings will come out with a good tumbling. And they can be reloaded, I did this for my .308 CETME many times with no issues.

Supermoto, that's a good picture.

55_grain

6hold · Oct 31, 2011

55_grain said:
This. 90% of the markings will come out with a good tumbling. And they can be reloaded, I did this for my .308 CETME many times with no issues.

Supermoto, that's a good picture.

55_grain

+1 Excellent photo [thumbsup]

JuergenG · Oct 31, 2011

Definitely from a HK rifle. 7.62x51/.308 from my SL7 looks the same.

Strange markings

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