Pennsylvania Firearm Owners Association
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  1. #1
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    Default What is the hole size on a gas block usually?

    Basically my question is: what is the margin of error of gas block alignment? I assume the hole in the block is bigger than the barrel gas port... How much bigger? How much movement can happen before gas flow is impeded?

    Also what is the consensus on thread locker for gas block set screws?

  2. #2
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    Default Re: What is the hole size on a gas block usually?

    May have found the answer... Most set-screw type low profile gas blocks are either 0.136" or 0.159" so there's a pretty generous margin of error with respect to gas port alignment.

  3. #3
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    127.0.0.1, Pennsylvania
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    Default Re: What is the hole size on a gas block usually?

    I always heard the gas ports were 16/87ths.
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  4. #4
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    Default Re: What is the hole size on a gas block usually?

    Quote Originally Posted by streaker69 View Post
    I always heard the gas ports were 16/87ths.
    Might be just a hair overgassed except for the bottom barrel bargain brands around today for $0.90 a round

  5. #5
    Join Date
    Feb 2010
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    Levittown, Pennsylvania
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    Default Re: What is the hole size on a gas block usually?

    Yep. 16/87ths. Be very careful that the block is exactly 420 degrees.
    There are only two kinds of guns. Those I have and those I want.

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