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[sidewinder]

I recently was hired on as the tech for the local Airsoft field here. We rent out some Echo 1 G36s. We have about 8 of them in varying stages or repair. About 5 of them are all having the same problem. They only fire when the trigger is pulled and pressure is applied to the left. You have to just pull the trigger and push it to the left at the same time and they fire.

I completely took apart, cleaned, lubed, shimmed, and re-assembled the gearbox and tested it out of the gun body. I also paid special attention the all the electrical contacts in the there and cleaned each and bent them so they made optimal contact. I didn't have any problems when the gearbox was out of the gun and test fired but when I put it back in the g36 body and tried it I had the same problem. The gun only fired when the trigger was pushed to the side. 

Has anyone encountered this? It can't just be a coincidence that 5 of our guns are doing the same thing and I am out of ideas here.

Thanks in advance for any help.

[kdb135]

Sounds like some kind of alignment issue. I assume none of them are missing any parts, so I'd have to troubleshoot them myself to really give you a conclusive answer.

One thing that really popped into my head though was a M4 I was working on a while back that had a very similar problem. The gearbox seemed to be sitting to the left in the lower, so what I ended up doing was taking two lengths of zip ties, cutting the heads off, and gluing them together. I then slide them in between the gearbox shell and lower receiver. Fixed my problem perfectly. Might help, might not, but it's worth a shot... Just something to push the gearbox to the opposite side.

Just kinda spit-balling ideas here, as I've never heard of that problem in a G36 before.

[locprecision]

My gosh, I had the same baffling problem last year on a G36.  Everything worked O.K. with the gear box out but as soon as I put it back together it would only fire when I pressed the trigger in and to the left.  Cleaned contacts...everything etc. etc.  Never did figure it out.  Sold it later on.  locprecision.

[d4rthf4c3m4n]

I fixed a friend's CA AR10 that did the same thing. Turns out the contacts were spread out a little too far so you had to pull the trigger and kind of twist it to get it to make a connection. It made a good anti-theft device since he was the only one that could actually get it to work. Anyway, I would clean them up and bend them together slightly. You can test the trigger without the piston/spring/guide in so you can fine tune it without the hassle of putting it completely together every time, just the shell, wiring and motor.

[kdb135]

I also paid special attention the all the electrical contacts in the there and cleaned each and bent them so they made optimal contact.

Said he checked the contacts.

[sidewinder]

I suspect that somehow the screws that anchor the gearbox into the body of the gun are tweaking the little plastic box that houses the trigger contacts shifting it by a fraction of a millimeter somehow.

I will be taking apart another g36 with a similar problem sometime soon. I will post back if I can fix this problem so we have an explanation/solution on record.

Thanks all for reading/posting.

[kdb135]

Now that I have had a few G36 replicas apart recently I have to ask. That little tab with the spring that pushes the contacts up. Are the tab and spring both in place?

[sidewinder]

Can you be more specific?  I think I know what you are talking about. Are you referring to the contact points in the wiring harness? The little copper stud that slides in and completes the circuit when the trigger is depressed?

[kdb135]

No, it is the little tab that goes in the trigger well, and there is a little spring that goes right above it and pushes up on the trigger assembly on the underside of the gearbox. Never knew if it had any importance, but if it's not in there that could be your problem.