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Thread: new Polish blanks

  1. #31
    No Hope For Me Coils's Avatar
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    the purpose of me re-starting this thread was to jog folks memories as to who was setting up operations to heat treat these blanks??
    I think TheDarkNight (I hope that's right) was offering it, but I don't know if he was doing it with the rails in or just the receiver as you received it as an 80%
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  2. #32
    GuncoHolic Rahatlakhoom's Avatar
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    Quote Originally Posted by 555th View Post

    From what I've gathered:
    After the spot welds are done, the blank should be stress relieved at 750
    After SR the receiver gets heat treated at 1600 and quenched
    After Heat treat the receiver gets annealed to 700 and slow cooled

    This is how I did my last two. Used a buddy's kiln. Took most of the day for two receivers, but they did turn out great.

    In the process of piecing together my own kiln, the parts are surprisingly cheap.

    I picked up a used heat treat furnace (Cress) at an auction for
    cheap. Still works.

    After rails installed and holes drilled. I take the raw receiver and ramp it
    up to 1600 F Quench in cold brine, (room temp).
    Then take it back up to 750F shut off furnace and let it decline over
    4-5 hours. Boy, this is the greatest thing since lincoln logs.
    Charter member-Busted Box Club est. 2006

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  3. #33
    GuncoHolic Sprat's Avatar
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    555th & coils

    thanks for the leads

    sprat
    Sprat and sprat1 are one and the same.

  4. #34
    Gunco Regular The Dark Knight's Avatar
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    I am going to list the service on my site very soon.

    I will offer rails and flats to be heat treated. I won't be welding anything though.

    Thanks

  5. #35
    GuncoHolic Sprat's Avatar
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    PM sent
    Sprat and sprat1 are one and the same.

  6. #36
    Gunco Member jh45gun's Avatar
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    Quote Originally Posted by 7.62x39 View Post
    There seems to be a little confusion regarding these blanks. There are definitely two different versions, so beware.

    One version is reported to be dead soft, most likely requiring more than just the axis pin holes and ejector to be hardened. It also apparently has a sanded finish making refinishing a little more difficult.
    The difference is easy to spot, the Sportsman guide (and some other vendors) does not have the chicken feet.
    The ones that Copes and AK builder are selling are (from what I can tell by finishing a couple) exactly the same metal as the flats that they have been selling. Making hardening and refinishing the same as we have been doing all along with the flats.

    Here is a comparison of a bent blank from Copes and a flat from akbuilder that I have bent. They appear to be the same.
    I took a center punch and gave them both the same whack in a spot that will be covered by the PG. The results were identical.

    Top pic is from SG website
    Sorry to bring up an older thread but I and my friend just got three of these Polish blanks from Sportsmans Guide and ours are smooth finished not sanded and they have the "Chicken Feet" if that is what you all call the X and Y markings.

  7. #37
    No Hope For Me Coils's Avatar
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    they have the "Chicken Feet" if that is what you all call the X and Y markings.
    Yes that is what is meant by "chicken feet", but saying the X & Y stamp(ing) will still be understood.

    And thanks for the heads up that you got these from SG
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

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