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Carbon on your barrel inside your handguard won't hurt anything. We're dealing with high pressure gas and unsealed fittings. They're going to leak. If you shoot your guns, they're going to get dirty, scratched, etc.
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Agreed. I've built 4 dream builds, all with adjustable GB's. 2 from Superlative Arms, 2 from SLR. All clamp on nitride. All use nitride gas tubes. 3 are mid, 1 is carbine length. No matter what, you shoot them, they leak a bit.. even with the gas pressure throttled way down. All function flawless and the tiny amount of leak does not hurt a thing.
Does make my OCD go a bit nuts... but whatever.
And like Rkangel777, I found that Faxon nitride barrels hide the dirt better than my SS Odin Works barrel.
Go shoot, have fun, relax.
Rock on,
Jim