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AR-15 Gas block screws

Discussion in 'Gunsmithing and Repairs' started by 119er, Aug 14, 2014.

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  1. 119er

    119er Member

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    Have a BCM low-pro gas block and had to drill a set screw out. Appears to be 8-40 but not sure. Anyone know? Or know where I can buy the set screws? Hardware stores seem to be all 8-32.
     
  2. rcmodel

    rcmodel Member in memoriam

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    I don't know what thread they are.

    But Houston is a very big city.
    There should be almost no end of industrial supply companies there that stock every size Allen-Head screw ever made.

    Check the yellow pages, and take the gas block with you to try it on for size.

    rc
     
  3. ApacheCoTodd

    ApacheCoTodd Member

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    Try 8-36 or M-4.
     
  4. BBBBill

    BBBBill Member

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  5. Reloadron
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    Reloadron Member

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    You want 10-32 screws 3/16 Long. You should be able to find them just about anywhere. That gas block is a set screw design. McMaster Carr has them at about $11 per hundred (life supply with a few left over) Just make sure you get the Knurled Point Cup design.

    Ron
     
    Last edited: Aug 14, 2014
  6. 119er

    119er Member

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    Thanks everyone. I went to Home Depot and picked up a 10-32 drill/tap on my way home. Job is done. I used a stainless cup tip setscrew along with the knurled cup tip originally included with the gas block. Some blue loctite and here we go.

    In the business I work in we will sometimes use cup tip set screws to act as a strongback to prevent axial separation of defective pipe/equipment welds. Typically on systems that have low thrust loads. The cup tips are used to "bite" into the pipe to prevent movement.

    Anyway, I think it'll do!
     
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