Help on m4 gearbox

Discussion in 'Gun Building, Modifications & Repairs' started by dylan484, Oct 5, 2012.

  1. dylan484

    dylan484 New Member

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    Well I've got an echo 1 stag arms m4 I took the gearbox apart because my trigger contacts were messing up and I found a little square piece that I think should attach to the gearbox shell right behind the trigger contact.
    Have I broken this part or is it just supposed to sit there?
     
  2. Archer627

    Archer627 New Member

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    Can you take a picture? It probably came off of your selectors plate.
     

  3. dylan484

    dylan484 New Member

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    I can later, it's between the cut off lever and the sliding part of the trigger mech if that helps?
     
  4. Archer627

    Archer627 New Member

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    I'll wait on pictures, but right now my money is on it being the plate on the selector plate. I'll go get pictures of this CA gearbox I have and you can tell me if that's where it is at.
     
  5. Archer627

    Archer627 New Member

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    Sorry for the double post:/

    Is the little plate similiar to the copper plate you see here? (take note that that copper plate goes all the way around).

    image-2395314694.jpg
     
  6. dylan484

    dylan484 New Member

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    It's on the inside of the gearbox shell
     
  7. Archer627

    Archer627 New Member

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    How big is it? Rough estimates will work, but precision is preferred.
     
  8. dylan484

    dylan484 New Member

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    Disregarded the solder, I tried my best to put it back to no avail.

    image-961272159.jpg
     
  9. Archer627

    Archer627 New Member

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    Ahh. The contact for the trigger trolley. You're going to want to buy a new trigger mech. SHS makes a good one.
     
  10. dylan484

    dylan484 New Member

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    It seemed like it broke off of the gear box though? The trigger mech is plastic while that piece seems metal.
     
  11. dylan484

    dylan484 New Member

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    I think I found it.



    image-232052700.jpg



    image-2842940658.jpg

    It's that little metal stub, think I have to buy a whole new gear box shell?
     
  12. Archer627

    Archer627 New Member

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    Take a picture of trigger mech. :)

    EDIT: you may have to. Try and JB Weld the piece on.
     
  13. dylan484

    dylan484 New Member

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    Yeah, jb isn't working sooooooo I need a new gear box... What company do you recommend? Or any else for that matter.
     
  14. Mystery43_4

    Mystery43_4 New Member

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    You don't need a new shell. There are a couple of ways to fix a broken trigger post. I can't link you, so try googling it.
     
    Last edited: Oct 6, 2012
  15. dylan484

    dylan484 New Member

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    I wasn't even aware, thanks ill look it up
     
  16. sandtiger

    sandtiger New Member

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    Best way is to get a drill, machine screw, and dremel. Drill a hole where the trigger stock post should be the same size as your screw and then screw in the machine screw FROM THE INSIDE until the bottom is flush with the outside. Then cut off the screw head and excess with a dremel. I have yet to ever see this break if done correctly.
     
  17. dylan484

    dylan484 New Member

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    I'm gonna do it from the inside but any particular reason?
     
  18. sandtiger

    sandtiger New Member

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    M4s have very limited space between the gearbox and body and it is much harder to cut off the screw head from the outside then flip it over and cut the excess off the inside. Trust me I thought it would be faster once... Instead I ruined a dremel bit and screw!!
     
  19. dylan484

    dylan484 New Member

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    Yeah, alright makes sense. Thanks

    Edit: i drilled and tapped the hole and put a screw in it now it works just like before, except i broke a gear..
    thanks for the suggestion though saved me money i now have to spend on new gears
     
    Last edited: Oct 16, 2012