Trigger keeps slipping

[Red (Eazy-E)]

Hello everyone, I am in the process of attempting to get my primary back up in working condition, and I keep running into problem after problem. The issue this time is one I have not encountered before.(Standard V2 Gearbox) When I get the gearbox all put together, it will function and cycle just fine for 3-5 shots, then the trigger will lock back and the gun will not fire. After doing this several times, I noticed that the trigger appears to be slipping off of the contact trolley, requiring me to take the gearbox off again and re-set it. Neither the trolley, nor trigger appear to have any wear or chipping on them that would cause them to not line up correctly, but for some reason they dont want to stay where they should once the gearbox has been put together. Anyone ever encountered this problem before, and if so, how did you fix it?

[Roger Monk]

I had the same problem with my VFC HK416 and I found out that the peg that keeps the contact trolly from going too far back broke. So I had to get a completely new gearbox shell. I will add a few picks to show you. I didn't notice the peg was broke until I took the gearbox apart and looked at how far the contact trolly was going back.


Hopefully this helps you.

Attachments:

[stealthyrt]

No way! That was the problem huh? Glad you got that sorted out... I never did, I always had problems with the trigger locking.

[T6e9a]

If you don't want to bother finding a new gearbox shell, an easy way to solve the issue, is drill a small hole where the peg was, find a short screw, and screw it in.

You will need to epoxy or super glue it so it doesn't come loose. Also need to dremmel off the head, and wherever it needs it so that the gears cycle without running into it.

I've done this for multiple guns, and has worked just fine

[ctres]

Oct 3, 2014 16:16:16 GMT -5 stealthyrt said:

No way! That was the problem huh? Glad you got that sorted out... I never did, I always had problems with the trigger locking.

I specifically remember looking for this issue on your shell since I experienced the same thing with my Lonex shell but I don't recall seeing it on yours, but regardless it is a very common issue on V2s. Mine broke on a brand new Lonex shell and I fixed it exactly how T6 mentioned. In my case an M3 bolt was the perfect size. The shell didn't even need to be tapped since the bolt was steel and cut threads into the aluminum shell without a problem so the fix literally cost me nothing. Once it was threaded I just epoxied it in and dremmeled off the head once it dried. It's been holding up for thousands of rounds since. I would guess that this is most likely your issue if you do not see any wear. In the case of wear the trigger trolley will typically snap back when the trigger is fully depressed, even on full auto when the cut off lever is not engaged,

[Red (Eazy-E)]

Taking apart the gearbox now to see if that peg is the issue, will report back.

[Red (Eazy-E)]

Monk definitely hit the nail on the head, appears that peg is what broke off in there allowing the contact trolley to slide to far back, now my only question about drilling a hole and putting a screw thru it to act as the peg is that the selector plate is on the other side of where the peg is, so how do you suggest drilling a hole there, also, i have a piece of metal that MAY actually be the broken peg, but I was wondering if a dab of gorilla glue would be strong enough to hold that peg in place, or is the spring on the trolley putting to much force on it.

[Red (Eazy-E)]

well i tried it with glue, worst comes to worst, Im no worse off than I am right now, waiting for the glue to set, but it seems pretty sturdy, but I did have the broken peg, it ended up in my box of parts somehow hehe, ill let you all know how it turns out

[ctres]

Unless you have some kind of extremely strong epoxy I wouldn't trust it to hold with glue. To drill through it just remove the selector plate.

[Red (Eazy-E)]

I feel like im just being stupid at this point... Wont the screw head get in the way of the selector plate? or are you advising me to dremel that off as well as the rest of the screw?

[ctres]

Yes, the screw head would get in the way if you didn't dremel it. Take off your selector plate, drill the hole from the inside of the shell where the post used to be. Then flip the shell and thread the screw in through the outside. Thread it until the part inside is the exact height of the stock trigger post and make a mark on the screw. Remove the screw and put some JB weld or strong epoxy on the threads of the screw where it will contact the gearbox and screw it in. Let it dry 24 hours then dremel off the head that is sticking out where the selector plate goes and make sure it's flat. No need to dremel on the other side. You now have a new trigger post. Here is a pic of the final product. I may have better ones somewhere since this one doesn't give a very good view but you can kind of see it. Not that the trigger post is round not square, that is the screw.

[Roger Monk]

Ctres stated earlier that you will need to dremel it. I personally would get a nice long screw and make the hole only as big as the core of the screw to allow the threads to sink into the shell then use something like red thread lock or JB weld to keep it in place. After the glue sets, dremel to spec.

Edit: looks like me and ctres posted at the same time.

[T6e9a]

Just be sure yours extort gear can spin freely with out hitting the screw. Just be safe and check that.

[RUST]

So I am having a similar issue to this, except the peg is still in my gearbox. What is happening with mine is that the trigger is slipping past the contact part that moves forward. It will push it forward for a few pulls of the trigger, then it slips under it. I have tried two different triggers and two different contact pieces, but it still does it for both. Does anybody have an idea of why it could be doing this?

[Roger Monk]

Possibly you need to try a whole new (or different) trigger unit. It could be that a part is worn out or allowing too much movement up and down for the trolly.