Gas Tube from AR Sight Tower

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  • biglucky

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    Feb 3, 2009
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    Dripping Springs, TX
    I am having a problem that I hope someone here can help with.

    I am working on installing a 9" free float RIS on my 10" AR15 SBR. This of course means I have to remove the front sight tower and install a low profile gas block. I have got everything taken apart, but am having a hard time getting the sight tower to "let go of" the gas tube.

    Does anyone have a recommendation on how to get the gas tube out of the sight tower.
     

    40Arpent

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    Jul 16, 2008
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    I don't mean to insult your intelligence, but you did remove the retaining roll pin, right? If so, try soaking overnight with penetrating oil.
     

    40Arpent

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    When I say "penetrating oil" I am referring to products like Kroil, PB Blaster, Liquid Wrench, etc., that are designed to loosen stuck/rusted fasteners. I listed them in order of effectiveness, but Kroil is typically only available online or through industrial suppliers. You should be able to find PB Blaster at your local hardware or auto parts store. Spray liberally and let it "soak" for a few hours.

    Another suggestion would be to let the sight/tube sleep overnight in the freezer. Different degrees of contraction between the two metals can cause them to break free of one another. This can also be achieved by alternating between hot and cold, e.g., moving parts from boiling water to ice water.
     

    jdh

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    Mar 2, 2008
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    Leave the tube in and shave the sight risers from the gas block, then reuse the original (now low profile) gas block?
     

    MadMo44Mag

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    Jan 23, 2009
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    Ft.Worth
    When I say "penetrating oil" I am referring to products like Kroil, PB Blaster, Liquid Wrench, etc., that are designed to loosen stuck/rusted fasteners. I listed them in order of effectiveness, but Kroil is typically only available online or through industrial suppliers. You should be able to find PB Blaster at your local hardware or auto parts store. Spray liberally and let it "soak" for a few hours.

    Another suggestion would be to let the sight/tube sleep overnight in the freezer. Different degrees of contraction between the two metals can cause them to break free of one another. This can also be achieved by alternating between hot and cold, e.g., moving parts from boiling water to ice water.

    ++1
    In the machine shop I have had to do this many times with very good results. It works especially well on dissimilar metals. Steel on aluminum ect..
     

    jdh

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    And the gas block would still be pinned on instead of clamped/tensioned.

    It would be the gas block that was fit to that barrel at the factory and does not need to be clamped or tensioned to make it work/fit right. Put it back on, put the taper pins in and it is lined up with the gas port in the barrel and ready to go shoot.
     
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