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Thread: Forge markings on Uppers?

  1. #1
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    Forge markings on Uppers?

    I have recently discovered these forums and in turn, being the tech junkie I am, I am researching what I have and where it's made. I have seen various forge markings on uppers and wanted to see who knows what about who made them, etc.

    "A" or kind of "A" shape cut in half forge mark on right side of upper

    Keyhole forge mark on right side of upper

    M on the front of the upper above the gas tube hole(was told it was an "FN contract upper)

    Makers of Rock River Arms uppers (no markings, previous to the RRA marked uppers)

    Please feel free to add any not listed above.

  2. #2
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    Forging marks/makers.

    A (splintered) = Anchor Harvey Aluminum

    AF = Alcoa Forge

    C AF = Colt Alco Forge

    C MB = Colt / Mueller Brass

    Cardinal (stylized) = Cardinal Forge

    CH = Colt Harvey Aluminum

    CK = Colt / Kaiser Aluminum

    Circle/Crooshairs w/"AR" = ArmaLite

    CM = Colt / Martin Marietta

    D (stylized) = Diemaco

    DK = Diemaco / Kaiser Aluminum

    E = Emco

    EK = EMCO/Kaiser

    E MB = EMCO/Mueller Brass

    F keyhole = FNMI / Cerro Forge

    FA = FNMI / Anchor Harvey

    FK = FNMI / Kaiser Aluminum

    FM = FN/Martin Marietta

    FMB = FNMI / Mueller Brass

    Keyhole = Cerro Forge

    L = Lewis Machine & Tool

    LK = LAR / Kaiser Aluminum

    LM = LAR / Martin Marietta

    M (under diamond) = Mueller Industries

    PA = Capco / Anchor Harvey

    PM = Capco / Martin Marietta

  3. #3
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    I believe that just about covers it, thanks for the info man.

  4. #4
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    And THAT should be a sticky! Thanks for that info brother...

  5. #5
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    Any chance on getting another list showing the manufacturers and where they get there uppers?

    Case in point, my m&p15A has a keyhole mark on the right side of the upper, and so does my friend's bushy varminter.

    Maybe there's endless possibilities, but I've come up empty handed on googling this subject, and the knowledge base of M4C is quite incredible. Thanks in advance.

  6. #6
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    Quote Originally Posted by powderkeg45 View Post
    Any chance on getting another list showing the manufacturers and where they get there uppers?

    Case in point, my m&p15A has a keyhole mark on the right side of the upper, and so does my friend's bushy varminter.

    Maybe there's endless possibilities, but I've come up empty handed on googling this subject, and the knowledge base of M4C is quite incredible. Thanks in advance.

    Those are both Cerro forgings (unknown who does Bushmasters or S&Ws finish machining).

  7. #7
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    bump...

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