[ARCHIVED THREAD] - Overpressure ?

Posted: 11/4/2015 1:05:25 PM EDT

Went and shot my sbr yesterday, and it seems as if I'm getting ejecter/extractor swipes, colt 10.3 with .70 gas port, h buffer standard colt buffer spring,colt bcg. Multiple kinds of 5.56 did it. Would going to a h2 buffer help prevent early unlocking if that's what's happening?
Various ammo brands, xm193, pmc 5.56 m855, ssa 77gr, zqi m855.

Here's a few pictures of the case head, maybe a little swiping is normal but I have never noticed it before.

[URL=http://s1067.photobucket.com/user/carbon244/media/IMAG0576_zpsx5e9d2nf.jpg.html]

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Posted: 11/4/2015 7:56:31 PM EDT

[#1]

Carbine gas systems are hard on brass. A heavier buffer will help. The rifle tries to eject the fired case before it has time to contract after being fired.

Your primers look fine.

Posted: 11/4/2015 9:32:33 PM EDT

[#2]

Quoted:Would going to a h2 buffer help prevent early unlocking if that's what's happening?

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Yes, if that's the problem, then a heavier buffer could help. Going too heavy might prevent cycling with weaker ammo or at all.

Posted: 11/4/2015 10:06:44 PM EDT

[#3]

I've seen this before to various degrees. It's certainly not unheard of....most people probably don't realize if it's happening or not...

[ARCHIVED THREAD] - Overpressure ?

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[ARCHIVED THREAD] - Overpressure ?

[ARCHIVED THREAD] - Overpressure ?