scratch build 7.62x25 on ak reciver blow back - Page 6
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Thread: scratch build 7.62x25 on ak reciver blow back

  1. #51
    No Hope For Me 1biggun's Avatar
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    Xxxx
    Last edited by 1biggun; 05-20-2016 at 09:40 PM.

  2. #52
    No Hope For Me Coils's Avatar
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    Good idea Muttman.
    But remeber if you go this route you need to cut a notch in the barrel for the extractor to go into.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  3. #53
    No Hope For Me Coils's Avatar
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    are the TEC extractors avaliable any were cheap??
    Numrich is out and they show $21, seems a little high to me.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  4. #54
    Gunco Veteran muttman's Avatar
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    one should look to the sight sponsor's first.
    Cope's Distributing
    $21.99 not cheep but should work. when I get a chance I post some tec bolt photos. the cz52 extractors are chepper, $14 last time I looked but more work to fit. the tec extractor is more like a 1911 extractor and used no spring. muttman

  5. #55
    No Hope For Me Coils's Avatar
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    Hell I forgot he had some parts for them too.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  6. #56
    Gunco Veteran [486]'s Avatar
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    You could probably make something resembling a sten extractor pretty easily. Here, I'll draw a picture!


    You just cut a slot in the bolt, and drill a hole for the cross pin, and adjust protrusion [of the extractor] by filing the slot where it is closest to the bolt face. You can use a bic clicky-pen spring, as it has enough length on the lever part of the extractor that the spring's force will be multiplied about twice.

    EDIT: Oops, I forgot to radius the front corner of the "claw" part, don't forget to do that.

    Also, you could harden the front end by just heating it up till it is red and dipping it in oil, I remember hearing something about carbon from the oil going into the steel and making the surface into higher carbon steel.

  7. #57
    Gunco Veteran muttman's Avatar
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    [ I remember hearing something about carbon from the oil going into the steel and making the surface into higher carbon steel.[/quote]

    this proces will let some "free carbon" in from the oil, but not the near what is needed to harden the steel.
    nice pic. all most looks like a cz52 extractor. the print from a sten extractor that I have looks close to what you got their. muttman

  8. #58
    No Hope For Me 1biggun's Avatar
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    Xxcc
    Last edited by 1biggun; 05-20-2016 at 09:41 PM.

  9. #59
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    Quote Originally Posted by muttman View Post

    this proces will let some "free carbon" in from the oil, but not the near what is needed to harden the steel.
    Maybe heat it with a carburizing flame? How do they do it commercially? Kasenit? [That is the spelling of it on the can I've seen]

  10. #60
    Gunco Veteran Viper Dude's Avatar
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    Sten extractors can be made from 3/16 inch thick car leaf springs. I have made them even from old Fiat leaf springs. Scribe the outline on a piece of leaf spring and holding it in Vise-grips slice it out on an abrasive chop saw (carefully). A carbide end mill can true up the final shape and a small carbide drill bit can drill the cross pin hole. No heat treat was ever needed. They are already Rc 48 - 52 hardness.

    The cross pin hole can even be drilled first and used as a reference for the extractor shape.

    Afghan School of Home Gunsmithing !!!

    VD

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