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Exterior of gas tube coated in carbon
While changing an ALG defense rail, I noticed the exterior of the gas tube is coated in carbon for 3" beyond the upper (for the full barrel nut length + 1") and its coated 1" at the gas block. This is for a 16" midlength barrel. It has maybe 1000 rounds through it with this rail, no malfunctions. I normally don't change out rails, is all this carbon expected or a sign of a problem?
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As long as it's an accumulation of thinner soot layers, then yes it's okay. Heavy streaked lines can be another story.
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