I fucked up...
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    I fucked up...

    I was demilling a Yugo M72 RPK tonight and I fucked up royally for the first time. Not a scratch or a small egging. I fucked up and broke off one of the legs that are specific to Yugo from trunnions in my vice while attempting to hammer out the long rivet. Please, please tell me this is not structurally integral to the rifle. AKM trunnions don’t even have these so I’m hoping I’m ok.
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    Ugh, I smashed a glass against my garage door as well... Fuck me...it’s a 1988 trunnion and matching kit, the year of my birth.

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    Quote Originally Posted by Cincymaga View Post
    Ugh, I smashed a glass against my garage door as well... Fuck me...it’s a 1988 trunnion and matching kit, the year of my birth.
    Well you really fucked up!! I hope the glass wasn't full of burbon n coke! A terrible loss!!!
    As far as the tab you broke off is concerned I'm sure a good welder could replace it by building it up and shaping it.
    It may have had another purpose during manufacturing but I believe it's only purpose is to locate and align your lower hand guard, if you still have the small piece you may be able to epoxy it into location after you rivet everything in place otherwise you may have to find another way to shim that area so your hand guard doesn't shift.
    I hope the glass🥃 wasn't part of a good set!!
    JeepFan and scottyb like this.
    "America does not need to see the tax return of a billionaire who became a public servant.
    America needs to see the tax returns of public servants who became millionaires while being public servants"

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    Given how small that piece is I doubt it has any structural purpose. At most its just a guide for when the trunnion is being inserted into the receiver. The bulges on the RPK trunnion are already form fitting to the receiver and they'll be riveted in. Those little tabs ain't doing jack.

    Really they're probably just some artifact of the manufacturing process that helps align the trunnion into the receiver or some part that they couldn't be bothered to have shaved off. Either way, its not a concern for a hand-built rifle.

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    Quote Originally Posted by GTPI View Post
    Well you really fucked up!! I hope the glass wasn't full of burbon n coke! A terrible loss!!!
    As far as the tab you broke off is concerned I'm sure a good welder could replace it by building it up and shaping it.
    It may have had another purpose during manufacturing but I believe it's only purpose is to locate and align your lower hand guard, if you still have the small piece you may be able to epoxy it into location after you rivet everything in place otherwise you may have to find another way to shim that area so your hand guard doesn't shift.
    I hope the glass🥃 wasn't part of a good set!!

    This ^^^ no need to waste good booze.

    I would weld though rather than epoxy.

    Op, take a step back and relax, think your process through. It's not a race. Everybody makes mistakes. Building your own is supposed to be fun.


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    i'm not a specialist when it comes to yugos but pretty sure that part is needed so handguard doesn't wiggle. with that being said it is not structural in the sense that rifle mechanically will work whether it has that thing or not. check the handguard tab that gets inserted into the front of the receiver and pretty sure you'll see what trouble you will have in the future.

    good tig-welder can buildup some material slowly. this is far enough from locking lugs that probably doable with mig as well. just don't owerheat and anneal trunnion while doing it.


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    It won’t show, but if it’s always going to bug you then you could tack it back on.

    Or, if the lower handguard wiggles a bit, just shim it.

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    It is just to center the handguard. Handguards are interchangeable between stamped/milled receivers on yugos of the same types. I did it once a few years back, just weld it back on and you're good to go. Doesn't even have to be a great weld, there are no stresses on the part. If you don't have access to a welder shoot me a pm and I can probably help you out.

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    If you have the small lag part you could braze it or silver solder back on and file to shape..

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    weld it back on and clean it all up and you're good to go.

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    Thanks for the advice. I put everything away at that point. But upon inspection, I can see that it is meant to hold the lower hand guard steady. I have zero welding skills, but I have the small piece, it’s a pretty clean break. I’ll have to find someone to tack weld it back on for me and I’ll clean it with a dremel afterward.

    I switched from tap hammer to a standard due to impatience, and first whack...snap.

    I know better which is why i was so mad.
    Oh well, onwards...

  13. #12
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    just an example, but you can search Micro Welding.



    https://www.microprecisionwelding.com/gun-repair

 

 

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