Green residue on AR Bolt and Upper?

Looks like standard powder residue, to me.

looks like copper in the gas leaving deposits and oxidizing or something...Ive never seen that before

Im not that much an AR guy, but thats a butt ton of fouling for 65rnds and a really wierd color.

how old was that ammo?

That is definitely not normal in 65 rounds.

What Ammo?

Did you clean it with a copper solvent before shooting and leave the solvent on there? Hence the copper residue showing up.

What brand ammo? Looks like what I’d get after shooting Russian steel cased.....

I can't say I've ever seen anything like that. Looks like copper. How it got there is a mystery. I noticed everything looks very dry. What are you using for lubricant?

ETA - If this was the first trip to the range, it might be something left over from manufacturing. Clean it up really well and shoot it some more. See if it comes back.

Very odd. Did you clean and lube it before shooting? Might just be some sort of manufacturer rust inhibitor burning off. Would also explain why it came off easily when cleaned. On your next range outing, try a different ammo and see if you get the same results. That can help narrow down the cause quite a bit.

It's copper residue from shooting. Having it show up in 65 rounds is a bit weird.

My suppressor flash hider mount was damn near totally green after I spent a couple years shooting my suppressed AR without cleaning (just adding oil). Probably had something like 2-3 thousand rounds through it by the time it was done. Came off with some cleaner and a brush.

Shooting suppressed?

Looks like corrosive primer residue. It gets all over in a semi auto. I,ve seen that in AKs and SKSs with surplus ammo. What primers are you using?

Corrosive primers should be a thing of the long distant past, yes?
Willing to be wrong about this, but they cause such maintenance problems that militaries especially have avoided them.
I run my ARs wetter than that, but that's another issue.
Moon

Peakbagger46 said:

CCI small rifle standard primers.

Click to expand...

Well thats not it. I thought you may have picked some import primers like Wolf or others that were all over in the last shortage. I read some guys had issues with some batches of them.

How long was the interval between shooting and cleaning?

What powder was in the reloads?

Thanks for following up.

rbernie said:

What brand ammo? Looks like what I’d get after shooting Russian steel cased.....

Click to expand...

That’s exactly what I would say. The only times I’ve ever had this happen was with Tulammo and I only got it because I let it sit for a while before cleaning