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Thread: MG47 Jr.

  1. #11
    Gunco Member cntrailrider's Avatar
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    Got a little more done tonight -


    Made a left inside 'upper' rail (12") and installed it. Tray straddles the INSIDE rails, not the outside ones screwed to the trunnion, since they're too wide for the tray guides


    Started fitting the FT


    Temporary AK recoil spring to check rail-to-trunnion & rcvr alignment, and then chambering tests. Both of mine took some work before everything would cycle/lock/unlock easily, with the close-tolerance gas tube


    It chambered on the first attempt - sure didn't expect that! Got that same light-headed feeling again


    No ejector rail made yet - hopefully tomorrow


    Camera LCD is broke or it would be more centered

    If you're using a standard diameter piston, here is a handy way to de-burr the inside 'step' in your custom gas tube, with a power drill

    Gas tube is MUCH tighter seal (mallet fit) than a factory AK tube; had to drill out the back, so the BC snout could slide forward. That creates a smaller diameter 'step' deep inside the tube, and a problem when reassembling. Like threading a needle dozens of times, during the build. You MG47 builders will soon find out what I mean. Smoothing out that step was the key to easy reassembly

    Steve

    PS Got the 'upper' rails temporarily mounted, and ejection port cut out today


    Short vid chambering & ejecting
    http://media.putfile.com/Chambering--Ejecting
    Last edited by cntrailrider; 02-17-2008 at 10:30 PM.

  2. #12
    Gunco Member MkCanuck9r's Avatar
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    Sweet....looking good Steve!

  3. #13
    Gunco Member ctlaw74's Avatar
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    How did you go about locating the ejection port? Any specific dimensions to follow or is it lick fingr and hold to wind?

    Thanks,
    Matt
    (I'm marking my steel as I type and my build begins.....)

  4. #14
    Gunco Member cntrailrider's Avatar
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    Finger / wind technique works real well

    Position the front exactly where it is on a regular AK, in relation the to RSB & trunnion. Cartridge is 2.2" long. Don't go back any further than that, for starters, until you begin test feeding & ejecting. Then study how/what path the ejector pushes the casing

    Had to enlarge the port higher than what's in the pic above - symetrical to the bottom, so they'd exit

    Steve

  5. #15
    Gunsmith Fritz's Avatar
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    Stop me if this is a dumb question, but with the elimination of the standard charging handle, how is it that the weapon is loaded initially?

  6. #16
    Gunco Member cntrailrider's Avatar
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  7. #17
    Gunsmith Fritz's Avatar
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    Ah, I see, thank you.

  8. #18
    Gunco Member cntrailrider's Avatar
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    Came up with an idea to eliminate the short-stroke lost pressure worries. Shorten the BC snout, then use a standard-length piston to keep the gas pressure sealed, for a longer sealed stroke. AZ Honkey suggested a good shortening technique (same as an HK51/51K) removing a section of BC snout, then re-join it, to keep the original piston threads. Need to cut the cocking handle slot, and get the 'cocking plate' made too

    Been on the road all week, but home now - progress pics should be along soon

    Steve
    Last edited by cntrailrider; 02-25-2008 at 06:27 AM.

  9. #19
    Gunco Member cntrailrider's Avatar
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    Starting to take shape






    Good shot of the rails. 'Bottom' rails are the top edges of the 1.5" tube. Planning a flush buttplate with guide tubes for the recoil springs


    The front will get trimmed even. Barrel is 9"/ OAL 22"


    Next comes the BC extension, and locating the feed stud


    Burned through the hinge pin shroud so you see some patch up. Hinge pin holes get hardened

    The gas tube goes through the rear sight block to keep pressure contained for a longer stroke. Same set-up as my 6 inch shorty, but longer (4.5" stroke) to cycle the belt feed mech. AMD65 piston in a bobbed carrier, to keep the tube ID small / sealed. Will get pics of it later

    Got alot of welding to do yet - some will be repair work No guarantee this will work, but hoping to be the first on my block with a 7.62x39 beltfed pistol

    Steve

  10. #20
    SHARPSSHOOTER5090 SHARPSSHOOTER5090's Avatar
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    Steve
    How are you going to mount your feed cam roller? Is it going to be like you did on your MG47 and does it have to be right on center on a RPD cover? It appears that the the cam does not track quite on the center line of the top cover.

    Sharpsshooter5090

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