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Your carbon residue is probably from a leaky gas block. - Either between the barrel and gas block, or the gas tube and gas block.
With or without the suppressor, that will happen if it's leaking.
I have a couple uppers with minor leaks. No big deal, unless you're sticking your face or fingers over the leak.
Common knowledge says that carbon will plug the leak eventually. I'm not sure whether or not I believe that.
I, honestly, have never gone back and checked on some of my leaks, to see if they have diminished or stopped.
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Don't even try it. It's even worse than the internet would lead you to believe.
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