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Posted: 4/19/2006 10:18:15 AM EST
I just got a PD trade in AR and there was carbon build up on barrel under FSB. Obviously there is a leak somewhere. I have never seen this before to this degree.
Link Posted: 4/19/2006 11:53:22 AM EST
not normal but is.

there probably was a leak where the gas tube mates to the fsb but the carbon seals it up and problem gone. nothing to worry about or panic over.
Link Posted: 4/19/2006 1:01:47 PM EST
No worries. The gun shoots fine. Just never noticed it before.
Link Posted: 4/19/2006 1:04:47 PM EST
Common. Mine does, but operates just fine.
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