HK USP Compact Extractor made from Delrin ??
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Thread: HK USP Compact Extractor made from Delrin ??

  1. #1
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    Default HK USP Compact Extractor made from Delrin ??

    Hi,
    I am thinking of carving or filing an extractor for my HK USP Compact from Delrin (polyacetal).
    Do you think it might work?

    The background to this is that I live in a very small country where it is almost impossible to get parts. For example, it took more than two years to bring in some springs. And lots of paper work.
    Delrin (polyacetal) is a polymer with strength similar to brass. It is easy to machine , readily available and not expensive.
    My HK USP Compact 9mm is ten years old. It is the only gun I have and likely to be the only one I will ever have.
    A broken part will render the gun useless.
    So I've been thinking of making parts from polymer because it is much easier to work on than metal.
    Please give me your thoughts.
    Thanks

    Gigie

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    While the product is phenomenal, its melting point of around 240F, or 130C would be your problem. Maybe you could machine a piece of steel? Good luck.

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    HK Customer Service is least expensive, give them a call.

    My custom Hi-Power has Delrin grips.
    It's not even close to being hard enough for an Extractor.
    The Spirit of God hath made me, the breath of the Almighty hath given me life

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    Thanks for the info about the melting point of Delrin.
    Yes , steel is a better idea.
    Any thoughts on the type of steel?
    I wonder what type HK uses?

  6. #5
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    HK Customer Service is not an option.
    Too much paperwork and years of waiting.
    Thanks
    Gigie

  7. #6
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    You could probably make an extractor out of 42CrMo4 and be in good shape.

  8. #7
    mew
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    D2 tool steel
    "All that is necessary for the triumph of evil is for good men to do nothing"
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    An big old wrench (1960's) from a pawn shop or yard sale would have good steel. Cut a chunk, cut grind and polish as best you can and try to oversize it and fit before too much gring or any polishing. Good luck.

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    Funny that an extractor would be very difficult to pick out in a bag of clock parts. Maybe you take up clock repair as a hobby. Get creative.

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    What kind of access to steels do you have? Any CRES? I'd be more concerned about corrosion issues with most steels out there, unless you can phosphate it after it's been machined.

    15-5, 17-4, 13-8, Inconel?

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