During cleaning, I noticed this stuff flaking off the inside of my receiver. Low round count on this rifle (700rds) as I use it seldom for coyote. But, I certainly didn’t notice this stuff flaking the last time I cleaned it. I am using TM solution on the bore and finished off with some SLIP EWL.
Anybody know what this crap is?
Thanks!
That’s a high friction/high heat area where the BCG rides. Looks like whatever green stuff you coated the receiver with is wearing off.
That green is factory anodized, I didn’t do anything to it. This is the Cabelas special edition of S&W’s Performance Center M&P 15 which also comes in black and RealTree. Look closely and you’ll see the receiver is green under whatever this grey gunk is…
I’m curious if I should find something to dissolve it completely and just get it all out of there. I also wonder if it was the TM Solution bore cleaner…
Contact the manufacturer…
Isn’t it just that dry lube film that’s in the receiver? 
That is what it looks like to me.
Yea, It was anodized then the dry lube film was applied (spray in). I wouldn’t worry about it. Just lube as usual. Dry lubes wear out eventually. You’re noticing it more because of the green anodizing.
TC
exactly which area is the flaking?.. the green or the greyish area?
as in… is the grey area flaking away and showing the green, or the inverse?
it seems like its the anodizing coming off the inside of the receiver…
ETA: that’s the dry lube film coming off and showing the anodic coating… you’re fine… just add lube
Sweet. Thanks guys.
I’ll carry on.
dry lube. don’t scrub that area too much or you can take it all off in one go…
Totally, although if I keep it lubed with what I typically use, I suppose there comes a time when it’s not needed. This rifle has seen limited use and I have a feeling the dry lube JUST started flaking after this particular cleaning session while using TM Solution. The interesting thing is that I didn’t notice any increase in gunk as I cleaned - almost as if the dry lube which did flake off disappeared without a trace. I had never seen dry lube applied from the factory like that before. It’s certainly not in my other AR’s.
Most upper receivers will have a dry film lube applied on the inner surface.
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It is neither high heat nor high friction. High heat is several hundred degrees F. High friction is brake pads on a rotor. The AR upper is neither.
Nice looking rifle, whats the length of the barrel?
It’s 20" - here’s a link to the rifle as stock from S&W. The green was only available from Cabelas: http://tinyurl.com/9dfzwd5
It’s the dry lube. Same thing happened to my first Noveske. I called them and after they laid down the science it was all good. Totally normal just keep her wet.
My gun also did that with standard black anodizing. Its becoming more silver inside, but still slick so Im not worried.
And this is just downright good advice.
Low friction coating, it will come off with any acetone based degreaser.
The low friction coating is stupid fragile. Why companies spray it in uppers when it would stand up to a cleaning solvent is beyond me.