Help me to identify this Upper....

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  • SavageEagle

    Grandmaster
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    Apr 27, 2008
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    AR Flattop Upper, 16" 5.56 A2 Flash Hider...

    Markings on the barrel are as follows:

    B MP 5.56 NATO 1/9 H BAR

    I guess I can take some pix if needed.
     

    SavageEagle

    Grandmaster
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    My BushMaster has the same markings, fwiw.

    Just trying to figure out who made the Upper. It has the same "keyhole" marking on the upper, but those were just the markings on the barrel. That would be awesome if it was a Bushmaster. I'd feel bad for the guy I traded though. He went from a Bushmaster 16" Upper, to a Model 1 Sales 11.5" Upper!
     

    SavageEagle

    Grandmaster
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    Ok, checked over the site. Lots of good info. THANKS!

    Now I have two more questions.... :):

    Magnetic Particle testing? I have no clue what it does, is for, how it improves the bore....

    HBAR.... WTF does HBAR mean? I thought it was just a heavy barrel, but I guess I'm wrong?
     

    r3126

    Sharpshooter
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    Dec 3, 2008
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    Indy westside
    Without wanting to appear a smartass (which I sometimes am) use Google on your 'puter. There is a wealth of information available.

    From Wikipedia:

    Magnetic particle inspection processes are non-destructive methods for the detection of surface and sub-surface defects in ferrous materials. They make use of an externally applied magnetic field or electric current through the material, and the principle that the magnetic flux will leave the part at the area of the flaw.
     

    shooter521

    Certified Glock Nut
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    May 13, 2008
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    Indianapolis, IN US
    HBAR.... WTF does HBAR mean? I thought it was just a heavy barrel, but I guess I'm wrong?

    No, you're right. :yesway:

    The upper is Bushmaster; the "keyhole" marking indicates that the receiver forging originated at Cerro Forge.

    And now, for a bit of useless (or useful?) trivia:

    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
     

    SavageEagle

    Grandmaster
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    Apr 27, 2008
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    Well I'd seen some info on the process but not for the barrel. i didn't know if there was something different about how they do the barrel versus, say, a piston cylider or something.

    I'd looked it up, just too much info to sift through and none of it pertained to AR barrels. I just got a bunch of tech pages about **** above my pay grade! LOL

    Shooter, I appreciate your help. I know, I'm ignant. :D I've seen the keyhole stamp on just about every upper I've held besides the Colt uppers. Figured maybe it was just a normal thing! :):
     

    SavageEagle

    Grandmaster
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    Apr 27, 2008
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    Nope. Both are 1/9

    Why would you rather have the 11.5"? And don't say weight cause that doesn't concern me as the difference isn't much.

    I wanted the full 16" barrel for better accuracy at medium ranges.
     

    JosephR

    Shooter
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    Apr 12, 2008
    1,466
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    NW IN
    Actually I have an 11.5" BCM barrel right now and it's perfect. Just long enough to provide clearance for mounting my suppressor while using the DD RISII rail. The complete package is just under 16" and I have no problem with accuracy at MOM sized targets at what I'd call average distances- 300m. I won't be shooting anyone farther away than that ;)
     
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