Inside my AR-15 Upper

[LNTT]

So yesterday I finally noticed something strange as I was cleaning my AR-15. Usually I just do the usual patch cloth run through barrel, clean BCG etc, and never really noticed the inside of my upper. When I took out the BCG, I noticed that there were large blotches of gray and signs of a dried out liquid it seems. Is the paint coming off inside of my upper? Or is it just carbon? Or is it just burnt out lube? What should I do? More cleaning? or more lube?

Thanks

[stix213]

pics?

[LNTT]

Hm, I will post a few once I get home.

[sleepercar]

There was something similar to this a little while ago in another thread. It wasn't anything to be worried about. I'm sure somebody will come along shortly and guide you to it.

[rero360]

Some manufacturers coat the inside with a dry lube that wears away over time that causes the appearance of discoloration, that may be what you are experiencing.

[CK_32]

[LNTT]

Here is a picture of what I'm talking about. It is the gray that I am talking about. My latest hypothesis is that it is possibly baked on Miltec lube that I used. Can anyone confirm? What do you guys think?

Thanks

[FeuerFrei]

New AR? Did you clean it before you shot it?
Militec conditioner won't look like that when ran thru an AR.
Does it wipe off?
I suggest you rinse and repeat.

[FatalKitty]

shot 1000 rounds through my brand new AR so far in 4 days... there is a lot of scratches, marks, wear spots. I am pretty much not worried about it

[PEBKAC]

Looks like dry film lube to me.

[goodlookin1]

Weird.

Looks like the inside was painted or powder coated and it's flaking/shearing off. I've never seen that before. I'm sure it's fine.....doesnt appear to have any structural damage....just a cosmetic thing. Maybe an out-of-spec bolt carrier or possibly an out of spec upper receiver is causing the wear???

I can tell you what it's not:

- Dried lube (oil doesnt do this)
- Carbon build up (it would be an even spread, not clear, absolute lines)

Who made your upper?

[dlewis7]

That's Teflon/dry lube thats baked onto the upper. My upper has it flaking off too, & looks just like your pic.

[LNTT]

Its a BCM upper. Any suggestions for cleaning it off to apply a new coat of Miltec?

[Brown Rock]

Does yours look like his?

[shark92651]

I wouldn't waste my time trying to clean it off or replace it as it has no bearing on the functioning of the firearm at all.