They are dirty but the biggest problem I`ve seen is people coating everything in oil. You might be able to get away with that on some firearms but not a gas driven AR. The oil collects the carbon and that`s what seriously gums everything up.
I also tend to disagree with the more maintenance as well. In my experience, they`re pretty forgiving as long as you aren`t abusing it and/or shooting it when it`s wet with oil. Everyone has had their own experiences though so I want to make it clear that I am not trying to say that you`re wrong. Just trying to add my $0.02 and show that it really is a situation where your experience may vary. For what it`s worth, the AR`s I`ve sent thousands of rounds through were military M16/M4`s and the chrome lined barrel and chamber may have an effect on that.
Now, I definitely agree on piston driven. They are a much cleaner set up and I just hate dealing with gas tubes.
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