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Old November 10, 2012, 08:59 PM   #21
Senior Member
Join Date: October 9, 2009
Location: North Alabama
Posts: 5,983
Colt rep says

I attended a Colt taught, M16 armorers class 5-6 years ago and the instructor made the statement that the gas tube was "essentially self cleaning".

I found that hard to believe, but do not clean mine, nor do I know anybody that shoots AR's, that does.
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