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Thread: fmk 3 pics?

  1. #21
    Gunco Member Artty's Avatar
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    I have a original demilled receiver . if you need the dimensions just let me know.
    Artty
    "IYAOYAS"
    FFL 07

  2. #22
    Gunco Regular akfiend's Avatar
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    that would be awesome Artty Thank you.

  3. #23
    GuncoHolic Rahatlakhoom's Avatar
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    Got FMK kit today from What a Country.
    All in good shape, if not great.

    FCG lower tray is nice and roomy.
    Has some nice features, feels good in the hand.

    Now to dream something up that works reliably.
    I plan to photo document my build process once I
    get going.

    Nothing more fun than a bag of chopped gun parts.
    Charter member-Busted Box Club est. 2006

    "I will adhere to the Patriot Act, the one signed in 1776"
    - Marc Anderson

  4. #24
    Gunco Member classicmachine's Avatar
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    Looking forward to see how this build thread develops

  5. #25
    GuncoHolic Rahatlakhoom's Avatar
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    I will post some internals photos tomorrow.

    I have some tubing coming from Aircraft Spruce. 1.634" I.D. .058" wall thickness
    That will be close to original dia. I don't have a big enough lathe to turn down
    the long bolt assembly.
    Charter member-Busted Box Club est. 2006

    "I will adhere to the Patriot Act, the one signed in 1776"
    - Marc Anderson

  6. #26
    GuncoHolic Rahatlakhoom's Avatar
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    Some quick shots.




    Top of mag rides high in the lower.




    Now to disassemble the bolt.




    Drive out two roll pins and it slides out.



    Profile of original tube.

    Charter member-Busted Box Club est. 2006

    "I will adhere to the Patriot Act, the one signed in 1776"
    - Marc Anderson

  7. #27
    GuncoHolic Rahatlakhoom's Avatar
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    6 hours later....


    I had the impulse to shove an AK-74 bolt into the FMK bolt carrier.

    AK-74 will readily accept 9mm round.

    Here are some comparative shots.



    Angle of ejector is different, but can be corrected.



    Lengths are about the same, closed vs. open.



    Can't you imagine a G2 Tapco FCG slamming this floating firing pin home?



    I haven't done the real analysis of tolerances of how an AK FCG would work, but instinct is leading me in this direction. It could be as simple as
    an AK semi-auto adaptation.

    (Yeah, that is a bottle of Victory, 12% brew ale.)
    Charter member-Busted Box Club est. 2006

    "I will adhere to the Patriot Act, the one signed in 1776"
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  8. #28
    Gunco Regular akfiend's Avatar
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    that is a brilliant idea! you could turn a spacer on a lathe to hold the ak74 bolt in the carrier. if you decided to go that rout. I would try to drill the original bolt first.

    this presents a problem though. A reduced ID tube would prevent you from putting in an original bolt when the bolt is assembled you would still be able to put a full auto bolt in the turned down bolt sleeve thing. so your finished semi bolt would need to be permanently assembled via weld or something.

  9. #29
    Gunco Regular akfiend's Avatar
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    or heres what im thinking.
    1. drill bolt for firing pin.
    2. weld in restricter bushing in the back hole of the sleeve the bolt rides in.
    3. turn down rear part of bolt so it will fit in the reduced diameter hole in the bolt sleeve.
    4. turn down diameter of bolt sleeve to fit inside reduced diameter tube.

  10. #30
    Gunco Regular akfiend's Avatar
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    Quote Originally Posted by Rahatlakhoom View Post
    I will post some internals photos tomorrow.

    I have some tubing coming from Aircraft Spruce. 1.634" I.D. .058" wall thickness
    That will be close to original dia. I don't have a big enough lathe to turn down
    the long bolt assembly.
    Sorry didnt read this at first I got excited and scrolled down to the pictures lol. So are you going to use a blocking bar instead of reduced diameter?

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