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Thread: Cannot loosen set screws on BCM gas block

  1. #1

    Cannot loosen set screws on BCM gas block

    I've tried heat and penetrating oils. I've rounded a few hex or Allen keys. I'm not sure exactly what size of hex/Allen key to use. I've got an Easy Out kit en route but would prefer to get the screws out, would appreciate knowing exactly what size of wrench to use.
    #RESIST

  2. #2
    banana republican blues's Avatar
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    LL, I don't know if this applies but I see this listing for their low profile gas block:

    Set Screws are Steel 10-32 x 3/16 Knurled Cup Point
    http://www.bravocompanyusa.com/BCM-L...cm-lgb-750.htm


    http://brdengineering.com/products/gas-block-set-screw
    Last edited by blues; 02-13-2017 at 12:14 PM.
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  3. #3
    I've heard BCM really douses the screws in red loctite. Have you tried Bob Smith Un-cure? I've had good luck with it when it comes to loctite.
    https://smile.amazon.com/gp/aw/d/B00...236_SY340_QL65


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  4. #4
    Member orionz06's Avatar
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    Quote Originally Posted by blues View Post
    LL, I don't know if this applies but I see this listing for their low profile gas block:



    http://www.bravocompanyusa.com/BCM-L...cm-lgb-750.htm


    http://brdengineering.com/products/gas-block-set-screw
    Typical wrench will be 3/32
    Think for yourself. Question authority.

  5. #5
    Quote Originally Posted by DanM View Post
    I've heard BCM really douses the screws in red loctite. Have you tried Bob Smith Un-cure? I've had good luck with it when it comes to loctite.
    https://smile.amazon.com/gp/aw/d/B00...236_SY340_QL65
    Not yet, but I ordered some yesterday.
    #RESIST

  6. #6
    Try freezing it.

    Then using a punch and hammer, give it a couple good hard taps.

    Then try your Hex/Allen wrench.

  7. #7
    Quote Originally Posted by orionz06 View Post
    Typical wrench will be 3/32
    Being so small, there's a good chance the screws are deformed with the effort to remove. You might try the next size up or a metric key, maybe a 2.5mm will get some purchase but it's likely no key that small will loosen the screw without deforming.

    If the top of the set screw is exposed try cutting a slot across it with a Dremel to enable the use of a flat blade driver.

    Soak it with the nastiest penetrant and leave it soaking for days, topping up every few hours.

    I think the easy out is likely your best bet but if the screw is a hard enough steel, it's not a guaranteed method.

  8. #8
    Member orionz06's Avatar
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    Quote Originally Posted by hiro View Post
    Being so small, there's a good chance the screws are deformed with the effort to remove. You might try the next size up or a metric key, maybe a 2.5mm will get some purchase but it's likely no key that small will loosen the screw without deforming.

    If the top of the set screw is exposed try cutting a slot across it with a Dremel to enable the use of a flat blade driver.

    Soak it with the nastiest penetrant and leave it soaking for days, topping up every few hours.

    I think the easy out is likely your best bet but if the screw is a hard enough steel, it's not a guaranteed method.
    The screws in question aren't that large in diameter so by the time you slot them with a dremel you're left with nothing to engage with a tool.
    Think for yourself. Question authority.

  9. #9
    Quote Originally Posted by orionz06 View Post
    The screws in question aren't that large in diameter so by the time you slot them with a dremel you're left with nothing to engage with a tool.
    Makes sense. Which also means no amount of torque from an allen key that size will remove them, has to be a chemical/temperature/drill solution. Might be easiest to just drill the set screws out, stopping just short of the barrel. There's a pretty good chance that either drilling or the easy out will damage the gas block.

  10. #10
    Member orionz06's Avatar
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    Cannot loosen set screws on BCM gas block

    The amount of material engaged with a good extractor allows them to be rather successful. The manner in which they apply force to the fastener also helps. I'd bet the price of a gas block on them working.


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    Last edited by orionz06; 02-13-2017 at 02:13 PM.
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