Gas Block Burr in barrel
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Thread: Gas Block Burr in barrel

  1. #1
    Gunco Rookie GTHappy's Avatar
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    Aug 2007
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    Default Gas Block Burr in barrel

    Just got a Double Star upper today. Looked down the barrel, noticed some crud. Tried to clean it out. Everything came out except the largest piece. I ran a bore snake through several times, no effect. Ok, ramped up to a brush on a cleaning rod. Better, but still there. Time for a patch. Hmm... still no better. Thats really odd.

    Doing some searches on, leads me to believe I have a burr at the gas port. Do I need to do anything about it? It's basicly a noticable black spot on one side of the bore. I can tell that my brush, patch etc. was hanging up there. On AR15, it seems that they either believe it will wear down as you shoot, or you can remove the gas block and clean it out. How do I remove the gas block? It's a low profile gas block on a heavy barrel. There appears to be three set screws holding it on. Do I need to just remove those and pull it off, or is it something more complex?


  2. #2
    rbthntr64's Avatar
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    Shoot it. It will be gone after a couple of shots. Seen it many times. If you dont want to do that you can remove the gas block by lossening the three srews and sliding the block off. Before you do, mark the barrel so it can go back to the same place.
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  3. #3
    gunco irregular moleman's Avatar
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    Feb 2005
    Next door to my neighbors house in Michigan
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    I bought a barrel from Eagle Arms (Armalite) years ago at a gun show that had the same thing. I pointed it out to the sales rep who said that it hadn't been shot since the gas port had been drilled and was normal. He said that it would disappear after the first or second shot. He was right and it turned out to be a very accurate barrel.

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