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    Legacy Member ROCK's Avatar
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    Gas Cylinder Lock Screw Markings Chart

    Does anyone know where to find a chart of post war gas cylinder lock screw codes?

    I have one marked BS and would like to know what SA serial number range used this screw.
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    Contributing Member Mark in Rochester's Avatar
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    Contributing Member Mark in Rochester's Avatar
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    Last edited by Mark in Rochester; 02-27-2021 at 10:59 PM.

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    BS is a late SA gas plug. Commonly found on 6 million S/N rifles.

    There is another plug marked S B or B S that is the early type, non-returning valve. That is a WWII plug.

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    Thread Starter
    Thanks for the links Mark, very informative,

    ---------- Post added at 01:30 PM ---------- Previous post was at 01:22 PM ----------

    Quote Originally Posted by Garandy View Post
    BS is a late SA gas plug. Commonly found on 6 million S/N rifles.

    There is another plug marked S B or B S that is the early type, non-returning valve. That is a WWII plug.
    Thanks Garandy,

    The BS one I have is the spring, returning type. Is it exclusive to the 6 million serial numbers? Does it show up in late 5.9 rifles?

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    Legacy Member Durango56's Avatar
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    In an article by Scott Duff in spring 2001 GCAicon he states BS screw was used from 5,36x,xxx-6,09x,xxx. It was the most common screw used above serial number 5,93x,xxx

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    Legacy Member ROCK's Avatar
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    Quote Originally Posted by Durango56 View Post
    In an article by Scott Duff in spring 2001 GCAicon he states BS screw was used from 5,36x,xxx-6,09x,xxx. It was the most common screw used above serial number 5,93x,xxx
    I have that GCA issue but I wouldn't have found that information without you. Thanks Durango,

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    Contributing Member Mark in Rochester's Avatar
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    Quote Originally Posted by ROCK View Post
    I have that GCAicon issue but I wouldn't have found that information without you. Thanks Durango,
    Free! GCA Journal Searchable PDF Spreadsheet Index Is Available Here!

    The below free and fully searchable PDF Spreadsheet file provides an index of the GCA Journals, from Volume 1-1 through Volume 34-4, Fall 2020. "Click" the below sample "thumbnail" to the right to see the SAMPLE full size first page of the GCA Journal Index:

    GCA Journal, Garand Collectors Association, Garand Info
    He is no fool who gives what he cannot keep to gain that which he cannot lose
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    Legacy Member ROCK's Avatar
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    Thanks Mark

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