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Thread: s20 underfolder (maybe?)

  1. #1
    Gunco Regular smartbomb's Avatar
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    Default s20 underfolder (maybe?)

    didnt want to hijack voland s20 thread so started new.

    after beating my head against a wall trying to get the gas knob out, i finally get to start something fun. i am deciding whether to go u/f or not. my decision hinges on this. looking at my u/f trunnion compared to the s20 receiver, something looks off. if i line up the upper rivet hole in the trunnion to the upper rivet hole in the receiver there is about 3-5 mm of excess receiver hanging off the back.






    my thought was to drill a new hole but it would be very close to the old, almost to the point of an oval. i think it would eventually slip and become loose the other alternative would be to trim the receiver to fit the trunnion but that would also mean trimming the cover.

    am i missing something?

    well here is the progress so far.



    al gore is full of carbon enriched shit

  2. #2
    No Hope For Me Coils's Avatar
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    am i missing something?
    No, I don't think so.

    If you can weld or know someone, I'd weld the rivet holes up and make new one, keep the trunnion toward the rear and try not to trim the top cover.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  3. #3
    Gunco Regular voland's Avatar
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    What is the country of origin on your UF trunnion. I used a Polish trunnion on my build.

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    Gunco Regular smartbomb's Avatar
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    voland they are romanian and only use 2 rivet holes at the rear.

    btw your build inspired this. just hope i can get it to work
    al gore is full of carbon enriched shit

  5. #5
    Gunco Regular voland's Avatar
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    Quote Originally Posted by smartbomb View Post
    voland they are romanian and only use 2 rivet holes at the rear.

    btw your build inspired this. just hope i can get it to work

    It should work. I would line up the U/F trunnion so that the slot for the recoil spring is in the same location as the factory one. If the holes don't line up, just weld up the old ones and drill new holes.

    On my build with the polish trunnion, only the long rivet hole lined up with the factory trunnion. All other rivet holes were off, and I welded them shut and re-drilled.

  6. #6
    Gunco Regular smartbomb's Avatar
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    i think thats what i'm going to do. there are no holes that match the romy trunnion. the top set are close but no cigar. i can weld the holes like i did on the side rail and redrill. its only 4 more holes. it took less than 20 minutes to weld and grind the rail holes and the old trigger holes.
    al gore is full of carbon enriched shit

  7. #7
    Gunco Regular smartbomb's Avatar
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    got motivated today.

    install folder trunnion, welded trigger guard



    prime



    paint



    letting it cure for final assembly.
    al gore is full of carbon enriched shit

  8. #8
    Gunco Regular voland's Avatar
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    looking good.

  9. #9
    No Hope For Me Coils's Avatar
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    Looking good

    Did you remove the original rear sight or cut/grind it? If you removed it, I can use it.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  10. #10
    Gunco Regular smartbomb's Avatar
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    coils i cut it out but have on on my 12 i am going to remove. tell me how to get it out intact and its yours.
    al gore is full of carbon enriched shit

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