Corroded ammo after shooting suppressed

[Bimmer]

Hornady Black 168gr

Well, that shouldn't be out of spec...


Does your AR-10 have an adjustable gas system?

If yes, then it's time to make an adjustment. (The ones I've read about have a "suppressor" setting that direct less gas back into the receiver.)

[223to45]

That doesn't make any sense to me...

I was taught to disassemble and clean a brand-new gun, before shooting it... If you didn't, then it's possible that the gun was shipped with a lot of oil or even some kind of preservative (think cosmoline) in the barrel, and that's part of your over-pressure problem and the gunk everywhere.

Also, when in doubt (when having a weird issue like this), disassemble the gun and clean it...

This is a built gun, everything cleaned before assembly.

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[223to45]

Well, that shouldn't be out of spec...


Does your AR-10 have an adjustable gas system?

No, right now it doesn't. But I am going to start looking at some.



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[Bimmer]

No, right now it doesn't. But I am going to start looking at some.

I think that's your answer...

FWIW, it seems like it should be fairly simple to install an adjustable FSB.

I shoot an M14-type, also without any adjustment (except on/off).
Some of the cool kids use adjustable gas plugs, but that's usually with suppressors (and California won't let me have one).

[markm]

I don't think so... Those are just stripes in the gunk, made as the last round slid forward out of the mag.

Exactly. Brass only splits like that at the neck.

[bfoosh006]

Be sure to look over all your parts... including your buffer system.

Interesting the gunk, did not corrode or collect on the bullets plastic tip at all.

A great example of why you shouldn't leave brass cased ammo in a chamber after shooting suppressed.

[markm]

Good FUKKING GOD!! This isn't corrosion. It's fouling.

Now you can see the gasses you're huffing with these cool suppressed ARs!

[bfoosh006]

Good FUKKING GOD!! This isn't corrosion. It's fouling.

Now you can see the gasses you're huffing with these cool suppressed ARs!

Sorry, if the word corrosion wasn't quite right. Just the only word that appeared to be appropriate at the time.

I just have never seen that much fouling crud in a mag with ammo.

I have seen similar blue/green crap on muzzle devices, but not on brass cased ammo.

[grizzman]

308s burn roughly twice as much powder as 5.56, sob seeing excessive fouling in the action/magazine doesn’t surprise me.