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Thread: Romy RPK to 7.92 x 57mm

  1. #1
    Veteran Rahatlakhoom's Avatar
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    Romy RPK to 7.92 x 57mm

    I had a barrel-less RPK kit that was collecting dust.
    I ordered an M76 barrel from Apex arms and a 4-pack of MG13 mags
    from IMA. AI also got an extended RPK (Yugo-type) receiver from
    Coldsteel solutions. 29 cm long.


    M-76 (Yugo)


    These parts set around for months until Jan. 1st I began to tinker.



    I learned that the longer mag creates an obstacle, and the hammer cannot
    reach the short 7.62x39 bolt. The bolt had to be extended along with the
    bolt carrier. Bolt carrier was extended by welding on an extension of
    scrap metal and milling to shape.



    I patterned the bolt mods after the M76 bolt. M76 is on the right.
    After I milled out the face, the dimensions are the same.
    I used a #8 bushing from Victor Machine to extend the bolt shaft.
    These are welding and milling mods.



    Another problem. The longer receiver makes the top cover too short.
    I took the front section from a spare cover and welded it onto the original.
    I use a mig with gas. It takes some practice.



    Next. The recoil assembly is now too short to provide the correct action.
    Instead of trying to lengthen the spring. I welded a stub to the back of
    the piston to compensate. I also had to add 3/8" to the gas piston itself.
    (more welding)



    I had to weld sleeves on each end of the gas block to get correct fit
    on the M76 barrel. I used spare pieces of the top Hand-guard gas tube cut
    into 1/4 segments. The RSB had to be reamed out slightly to fit over the barrel. The front sight block fit OK, but I welded on an FAL flash hider
    just because it fit nicely over the unthreaded end of the M76 barrel.

    Preliminary assembly:



    This was a time consuming build. Many details. The mag had to be
    modified to fit the AK config. Welding of stubs on each end was necessary.
    10 days later from the beginning of project it was completed.
    I did test fire it before painting.

    Bare:



    Bells and whistles. (I welded on a bayonet lug sideways)




    The internals:
    The FCG and center support are all shifted back due to the longer magwell.






    More shots:







    I don't know who added the by-line at the bottom of my thread.
    Probably the K98 guy.
    Proclaimed King of the AK homebuilders!

  2. #2
    Senior Veteran weasel_master's Avatar
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    Now that thing is sweet.

    You've gotta watch out for k98, he's a villian.
    Czar of all the Michigans

  3. #3
    WildBillCody's Avatar
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    Very nice, the only thing I don't like is the bayonet, why on the side? Nice job!!

    Are you going to do more then one mag?
    I love you guys...

  4. #4
    Veteran Rahatlakhoom's Avatar
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    I will have 4 mags for this. Just haven't got them together yet.
    The bayo thing was a wild hair, sideways was the only way to get a fit.
    I know rpk's don't need a bayonet...heh-heh.
    Proclaimed King of the AK homebuilders!

  5. #5
    Senior Veteran turbothis's Avatar
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    i have been wanting to do this for a long time. i am going to do the reweld-ing route though.
    nice build and very cool gun.
    have cnc mills, will work for food.
    http://www.gunsnorthwest.com/

  6. #6
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    k98k792's Avatar
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    That is freaking awesome! A lot of guys have talked about doing this over the years,but to my knowledge you are the first to accomplish it. Congratulations,outstanding!
    " Little by little the look of the country changes because of the men we admire. "

    COG# 792
    HANG IN THERE
    WE'LL BE BACK!

  7. #7
    Senior Veteran weasel_master's Avatar
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    How does it handle?
    Czar of all the Michigans

  8. #8
    Veteran AK AJ's Avatar
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    Nice work, Would love to know how it shoots.
    Please keep us posted.


    AJ

  9. #9

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    Now that is COOL!
    COG #6
    "Runnin's not a plan, runnin's what you do when a plan fails!"

  10. #10
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    Very cool indeed !!

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