View Full Version : Copper on Barrel Extension?
I shot 200 rounds through a new rifle yesterday. As I was cleaning it, I noticed what appears to be a copper mark on the barrel extension/chamber face/whatever you call it. I apologize for the poor picture, but if you expand it it should be visible. I can't think of why that would be there, but I can't get it off. I can't imagine that the tip of a round hit it or something without causing a malfunction, and there were no stoppages when I shot it. The picture isn't oriented well. The mark is to the right of the feed ramps rather than up top like it appears.
Any ideas, and is this indicative57385 of a problem?
Brass cases shed bits of brass here and there when feeding, firing, and ejecting. A piece might have got caught between the bolt and breach face, then smeared when the bolt locked. But who knows for sure. It looks like a non-issue.
Brass cases shed bits of brass here and there when feeding, firing, and ejecting. A piece might have got caught between the bolt and breach face, then smeared when the bolt locked. But who knows for sure. It looks like a non-issue.
The color makes it look more like copper than brass. I know it's hard to tell by the picture.
Well ask yourself...what in your bcg/barrel extension/upper receiver is made out of copper...anything? Is your lube that color?
Well ask yourself...what in your bcg/barrel extension/upper receiver is made out of copper...anything? Is your lube that color?
Nah, I use G96 CLP. The only thing I know for sure that's copper in there is when the bullet is fed. It's a BCM, if it matters. I bought the upper and lower separately.
I gotta think it was a bullet hitting right there during feeding. The angle looks about right, but would it have even fed if that happened?
If the gun didn't have a functional issue... it's NOT a problem. There's crap flying around all over in that area.
Nah, I use G96 CLP. The only thing I know for sure that's copper in there is when the bullet is fed. It's a BCM, if it matters. I bought the upper and lower separately.
I gotta think it was a bullet hitting right there during feeding. The angle looks about right, but would it have even fed if that happened?
If a bullet point made that upon feeding you would have gotten a pretty gnarly malfunction.
Maybe it's from hitting the feedramp, but some of the scraped copper got mashed up against the bolt face like you said earlier with brass. I guess it's not a big deal, I've just never seen that before and this is the first AR I haven't bought as a complete rifle so I'm wary about tolerance stacking. It was bought as a complete upper and a complete lower, though. Both BCM.
As long as the guns working it's not a prob.
Maybe it's from hitting the feedramp, but some of the scraped copper got mashed up against the bolt face like you said earlier with brass. I guess it's not a big deal, I've just never seen that before and this is the first AR I haven't bought as a complete rifle so I'm wary about tolerance stacking. It was bought as a complete upper and a complete lower, though. Both BCM.
You wouldn't have posted the picture and asked the question if you weren't concerned.
Just to allay your concerns, if you bought the upper as a complete unit from BCM (used the add BCG option) just call BCM and ask if they check headspace before they ship the uppers.
If they didn't and you are still concerned, find a local gun shop/armorer to do it for you.
I'm with the others, though, in the opinion you needn't be concerned.
I have it on good authority that complete uppers are headspaced and test fired, and it is highly unlikely that a complete lower bought separately would be the root cause of that smudge. I know the OP says it's copper, but to me, that looks like brass from the shoulder of the case. The opposite side looks to have similar marks as well, but not 100% sure from the photo.
I have it on good authority that complete uppers are headspaced and test fired, and it is highly unlikely that a complete lower bought separately would be the root cause of that smudge. I know the OP says it's copper, but to me, that looks like brass from the shoulder of the case. The opposite side looks to have similar marks as well, but not 100% sure from the photo.
I see what you're talking about in the picture. I took the BCG out again to inspect, but nothing's in that spot on the opposite side. Must just be the lighting.
Maybe it is brass and it just looks like copper for some reason.
I also notice a little bit of wear in the upper receiver on the right side near the gas tube. I can't get a picture that shows it well, but looks a little too far forward to be caused by the gas key. I found a picture of someone else experiencing similar wear in their AR. Mine's isn't nearly this worn, but it's in the same spot (this is not my gun, just one that shows wear in the same spot): https://i.imgur.com/0LOQiss.jpg
Oddly enough, I checked one of my other ARs and it has the same wear marks there.
Most likely caused by the charging handle. All good. Thanks for the follow-up.
I see what you're talking about in the picture. I took the BCG out again to inspect, but nothing's in that spot on the opposite side. Must just be the lighting.
Maybe it is brass and it just looks like copper for some reason.
I also notice a little bit of wear in the upper receiver on the right side near the gas tube. I can't get a picture that shows it well, but looks a little too far forward to be caused by the gas key. I found a picture of someone else experiencing similar wear in their AR. Mine's isn't nearly this worn, but it's in the same spot (this is not my gun, just one that shows wear in the same spot): https://i.imgur.com/0LOQiss.jpg
Oddly enough, I checked one of my other ARs and it has the same wear marks there.
Dr. Bullseye
05-21-19, 15:37
I had similar brass particles and asked about it. People said it was nothing and eventually it all went away and I was fine.
Just an update: I’ve managed to get pretty much all of the smudge gone with the chamber brush. I’ll just shoot it more and see if it happens again. Either way if it doesn’t malfunction it shouldn’t be a problem, right?
If it was copper, could it have happened when ejecting a live round? When I first started with it, I shot 5 rounds and ejected the last one to go cold.
I want to be sure it’s not even possibly an issue because I love this rifle. BCM makes an excellent carbine.
I don’t see a problem.
Sent from my iPhone using Tapatalk Pro
Correct. If it starts to malf, report back.
Either way if it doesn’t malfunction it shouldn’t be a problem, right?
I was able to replicate a mark in the same spot by ejecting a live round slowly. Observing it during the process, I can see the tip of the bullet rubbing up against that spot. When I let the bolt fly home before it ejects/extracts, it still rechambers just fine. Anyone else have this happen to confirm that it's normal?
57407
I was able to replicate a mark in the same spot by ejecting a live round slowly. Observing it during the process, I can see the tip of the bullet rubbing up against that spot. When I let the bolt fly home before it ejects/extracts, it still rechambers just fine. Anyone else have this happen to confirm that it's normal?
57407
It is fine. You are overthinking this completely. There is a lot going on in there that you can't see when you are firing the gun, if you worried about every little bit of it you'd never get time to shoot. An empty casing will rock up and out to the right when ejected after firing.
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