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  1. #11
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    BG date code. Circle present on left side of chamber. No E7 or other markings on barrel.

    Mark 23 Barrel Markings and Surface Material-e4286cea-ed30-4890-a88c-036a2757e867.jpeg
    Mark 23 Barrel Markings and Surface Material-782ed618-7ee5-4b12-a786-11e7c84d009a.jpeg
    Mark 23 Barrel Markings and Surface Material-f74655a3-8272-4d44-bfcd-0b5cf90317b8.jpeg
    Mark 23 Barrel Markings and Surface Material-7d7bdf31-3457-41f0-8040-5f4128d1f47b.jpeg

  2. #12
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    Quote Originally Posted by ToyCop View Post
    BG date code. Circle present on left side of chamber. No E7 or other markings on barrel.

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    Most excellent--- thanks for the pictures!!!
    I may need to start a post in the HK Reference Library.

    Tony

  3. #13
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    Mine is a 2010 pistol.

    Circle is there. But it isn't a cartouche. Looks to me like an artifact of machining or an intentional thinner spot for pressure relief in case of a failure. Pure speculation on my part.

    On the left side, upside down and just above the horizontal centerline ahead of the hood, is dimpled "M2"

    Paint goes to end of barrel, threads and all.
    Mark 23 Barrel Markings and Surface Material-barrelbottom.jpg
    Mark 23 Barrel Markings and Surface Material-barrelleft.jpg
    Mark 23 Barrel Markings and Surface Material-barrelm2.jpg
    Mark 23 Barrel Markings and Surface Material-barrelright.jpg
    Mark 23 Barrel Markings and Surface Material-barreltop.jpg
    Attached Thumbnails Attached Thumbnails Mark 23 Barrel Markings and Surface Material-dsc_0270.jpg  
    Last edited by Cobblestone; 03-05-2020 at 08:36 PM.
    My opinion's as worthy as one from any other doddering old grampa you have never met or heard of.

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  5. #14
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    Quote Originally Posted by Cobblestone View Post
    Mine is a 2010 pistol.

    Circle is there. But it isn't a cartouche. Looks to me like an artifact of machining or an intentional thinner spot for pressure relief in case of a failure. Pure speculation on my part.

    On the left side, upside down and just above the horizontal centerline ahead of the hood, is dimpled "M2"

    Paint goes to end of barrel, threads and all.
    Thanks--- where the "E7" would be (?)--- or pictures!!!
    Also, see my new post in the HK Reference Library--- I added your information to the original post.

    Tony

  6. #15
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    I don’t have a MK23.
    That’s what is looks like to me, not a glyph but a tooling artifact/index... IMO the block is born from a MIM then the chamber/lugs are machined (?).
    The barrel E7/M2 nomenclature is an inv/process/control/eng-CO on the forging (?).
    I don’t get the dual-color. From the pic, there appears to be a tool mark where the paint ends, where the forged barrel moves down the line to get the threads/groove/crown machined. But the 23 only has a TB, so why not paint it at the final/complete stage (and install the o-ring).
    Interesting.

  7. #16
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    And no, it’s not a hardness stamp per-se. At least in the US, hardness is rated in Rockwell scale, HRx depending on test material. I wouldn’t stamp hardness on the finished product anyway, to what end. You would test/confirm hardness of the raw/pre-mach material/billet, statistically sampled then inventoried. Yes, conceivably the test data is recorded in the E7/M2 code.

  8. #17
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    BG date V5 or Y5
    Mark 23 Barrel Markings and Surface Material-img_3156sm.jpg
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  9. #18
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    HKCS response:
    "As far as the dimple on the left side of the barrel, that is normal and we have been doing that for the Mark23 for quite some time. The E7 you see on the barrel is an internal number that determines which machine the barrel was forged on. The black painted finish does not come all the way down to threads any longer either. The gray finish is still the hostile finish its just not painted."

    Now we know. Dimples are the German way. E7 is a barrel forging machine. No black paint at the end of the barrel saves $0.02. Got it.
    Last edited by WarEagleVI; 03-06-2020 at 02:58 AM.
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    Regards,

    WarEagleVI

  10. #19
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    I figured the answer was simple.

    Oh well. At least I can say MINE is a rare Mark 23 M2 marked version, which sounds better than Y3 or E7 like the others have. Even though it means nothing and amounts only to name dropping because it refers to the name of a robot in Germany who I have a connection to.
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  11. #20
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    Quote Originally Posted by M1garand View Post
    BG date V5 or Y5
    Click image for larger version. 

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    Thanks!!!

    Tony

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