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Well FTFs are very high in dirty ARs usually caused by dirty gas pipes.
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you are talking about the gas tube(that runs from the gas block on the barrel back to the carrier)...correct?
ive never heard of any issue with those other than leaks or breakages.
even if it were to get dirty/clogged(which would be difficult i would think,with the pressure that runs through it),im not sure how that could cause a FTF?
FTE maybe?if the round extracts...shouldnt the buffer spring be the only acting force on feeding?i dont see how the gas tube would interfere.