TM MEU trigger problem

[Amos]

Hey there, I recently got a BNIB Tokyo Marui MEU.

I can't recall if everything fired 100% perfectly when I got it... because 10 minutes into receiving the gun I had it torn down for a cleaning/re-lube/upgrading.

DSCF7018.flv video by AmosEverglade - Photobucket

This is a video of what it's doing, I was taking my finger out of the trigger guard each time to illustrate the trigger pull a little more clearly.

It may be a re-assembly problem as I had everything taken down pretty much as far as it could go before re-assembling it.

When I first took it down I lost part #GM4-49 (Little spring on the disconnecter {Part GM4-48}) and replaced it with one from a TM 1911

Here's a list of the upgrades that it has:

Airsoft Surgeon Ultra light Blow Back Unit (machined to fit MEU rear sight)
Airsoft Surgeon Hard Loading nozzle
Firefly bearing Spring guide
Firefly Lightweight Metal Floating Valve
Stock Recoil Spring
Guarder 150% Hammer Spring

Anyone have any ideas? This is my first 1911 and the first 1911 style gun I've worked on... sooo I'm still learning.

[KEVORKIAN]

Did you touch the sear spring at all?
Is the trigger pull smooth or restrictive?

[RacingManiac]

I think the 3 pronge leaf spring is not seated properly, maybe bent....

[Thenooblord]

had the same problem with my 1911, take the leaf spring out and bend it forward at the prong that pushes on the sear

[IRONSIGHT]

Three things to check, and I'd check them in this order to save extra work.

1- Check the over-travel screw in the trigger itself. If it is turned in just a little too far this can happen.Take it completely out and see if that solves the problem, Then put it back in with loctight and set it so there is still a bit of overtravel.

2- The sear spring mentioned above.

3-You may need to check out the trigger/linkage. It may have been slightly bent where it attaches to the trigger, when it was removed/installed. If it is bent ever so slightly it can be tight in the lower frame. Take it apart and see if the trigger mech slides in & out freely. it should fall right out the back if you tip it up. You may need to bend the trigger left or right , up or down. You should be able to see where it's tight if this is the problem.

Hope this helps.

[Amos]

Originally Posted by KEVORKIAN

Did you touch the sear spring at all?
Is the trigger pull smooth or restrictive?

Trigger pull is completely smooth... there's not much to it though, there's about 3/4" trigger pull on it.

Originally Posted by RacingManiac

I think the 3 pronge leaf spring is not seated properly, maybe bent....

How's it supposed to look?

Originally Posted by IRONSIGHT

Three things to check, and I'd check them in this order to save extra work.

1- Check the over-travel screw in the trigger itself. If it is turned in just a little too far this can happen.Take it completely out and see if that solves the problem, Then put it back in with loctight and set it so there is still a bit of overtravel.

2- The sear spring mentioned above.

3-You may need to check out the trigger/linkage. It may have been slightly bent where it attaches to the trigger, when it was removed/installed. If it is bent ever so slightly it can be tight in the lower frame. Take it apart and see if the trigger mech slides in & out freely. it should fall right out the back if you tip it up. You may need to bend the trigger left or right , up or down. You should be able to see where it's tight if this is the problem.

Hope this helps.

http://img.photobucket.com/albums/v2...g?t=1250897995

Is the "Over-travel" screw GM4-67? As well as the linkage being GM4-69?

If the screw is GM4-67 I don't know if it's adjustable in the MEU, I can't seem to find a metric or imperial allen key that will actually turn it.. (perhaps I just haven't been trying to turn it enough?)

What exactly does this over travel screw do and what do I look for when adjusting it?

(Lol I kinda like when guns I'm not experienced with break... When I fix them I end up quite familiar with the design lol)

[Thenooblord]

the spring on the right is supposed to bend forward, not backward
sorry i said sear spring before, i meant sear disconnector spring, the far right from that angle, bend it forward

[Amos]

Originally Posted by Thenooblord

the spring on the right is supposed to bend forward, not backward
sorry i said sear spring before, i meant sear disconnector spring, the far right from that angle, bend it forward

I'm not quite sure what you mean.. The spring on the right is bending forward and it interacts with the disconnector fine.. when the slide moves back and pushes it downwards, the leaf is pushing it back up.

Here's the leaf spring:

[Thenooblord]

well, when i got mine to work, it was bending at about 20 degrees forward, maybe your issue is different from what i had, but that video was exactly what mine did, dont know what else i can say, either way, more spring pressure wont hurt it

[Amos]

Originally Posted by Thenooblord

well, when i got mine to work, it was bending at about 20 degrees forward, maybe your issue is different from what i had, but that video was exactly what mine did, dont know what else i can say, either way, more spring pressure wont hurt it

All right I'll go look at a couple pictures of these leaf spring to see the different positions they're supposed to be in.

[Thenooblord]

also, add some lube around where the spring touches the sear connector, that also may be sticking, the issue mine had was that the connector wouldnt move because the spring couldnt push it up, either because of spring fatigue, or excessive friction, so i bent the spring forward to compensate the loss of tension, and that worked, then i regreased the whole thing for good measure, worked like a charm
Hope you get yours working too, MEUs are the shit ;p

[Amos]

Yup looks like that worked

I guess when I had everything tossed in zip-lock bags the leaf-spring was bent backwards a little too far.

My trigger pull is 10X stiffer now though ... Oh well, I'll take a stiff trigger pull over a mis-firing gun any day

Now I'm gonna go delete all those pictures on my photobucket because I'm reaching maximum bandwidth lol

[IRONSIGHT]

Originally Posted by Amos

Is the "Over-travel" screw GM4-67? As well as the linkage being GM4-69?

If the screw is GM4-67 I don't know if it's adjustable in the MEU, I can't seem to find a metric or imperial allen key that will actually turn it.. (perhaps I just haven't been trying to turn it enough?)

What exactly does this over travel screw do and what do I look for when adjusting it?

(Lol I kinda like when guns I'm not experienced with break... When I fix them I end up quite familiar with the design lol)

Your part numbers are correct. I don't know if it is adjustable on the TM trigger now that I think about it as I only ever had that issue with one of my Nova ones. As for what it does- It basically shortens the distance the trigger travels after the hammer releases so there is less distance for the trigger to travel on the return stroke= faster follow up shots. Over adjustment will stop the trigger from going back far enough to release the sear at all. If it's adjusted too close to "0" overtravel then you have the issue you've been having, especially if the screw is actually loose. Over bending the spring will sometimes solve the problem but I've found it to be a temporary fix if the issue is actually a trigger linkage one. If gm4-69 is slightly bent wich is quite possible if it was lying around in a bag the issue will return in time and repeatedly bending the spring to compensate for it being stiff will weaken it (the spring) over time.

[Amos]

Cheers,

I've had my eye on the shooter's deisng light weight one anyways

If it keeps bending out of shape I'll just get the SD one

I'm pretty sure that screw on the MEU isn't adjustable... no allen key metric or imperial would fit

[ILLusion]

That "adjustable screw" on the TM trigger is a dummy. It can't actually move, and it doesn't even go through. Sorta stupid, if you ask me - but I suppose it dummy proofs the pistol.