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Thread: Mil-Spec Gas Tube Roll Pin

  1. #31
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    The sealant, type, and location are on the bolt carrier assembly drawing. You can also find it and the location it is to be applied in the Colt Canada repair manual from that web site.

  2. #32
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    Reassemble the key to the bolt carrier as follows:
    a. Clean the mating surfaces of the bolt carrier key, and bolt carrier, thoroughly;
    b. Apply a light layer of sealing compound, to the under surface of the bolt carrier key around the gas port, to form a seal;
    Apply the sealing compound sparingly and only to the area immediately surrounding the gas porthole. DO NOT allow it to enter the gas port or screw holes. Ensure that the gas port is not plugged.

    It doesnt say what kind of sealer.
    Big brother is watching...and listening.

  3. #33
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    On one drawing it shows Permatex # 3D Aviation form a gasket. It only take a very thin small circle around the hole to spread out and seal it. It is easy to over apply it. I use the end of a tooth pick dipped in it. The couple of old Colt carriers I have taken the key off of had a nice little circle where the sealant was around the hole. Not even sure how they applied it so precisely in a circle.

  4. #34
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    Thank you!
    Big brother is watching...and listening.

  5. #35
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    Quote Originally Posted by lysander View Post
    Both of these use ASTM A574 screws.
    The BCM screws have the 1/8 drive size.
    Big brother is watching...and listening.

  6. #36
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    Then they are probably the correct type.

  7. #37
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    Quote Originally Posted by titsonritz View Post
    McMaster-Carr, 420 Stainless Steel Coiled Spring Pin, #93740A622 5/64" Diameter, 5/16" Long is what IG gave me during one of his classes and what I've been using for years now.

    $8.73 per 50
    https://www.mcmaster.com/catalog/127/3604
    This. Just buy a pack an be happy.
    "your AR is shit, change my mind" - Will Larson

    I make work horses, not show ponies.

  8. #38
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    Quote Originally Posted by lysander View Post
    Then they are probably the correct type.
    BCM doesn't sell them individually and they wouldn't tell me where I could get them.
    Big brother is watching...and listening.

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