Gunsmithing Triggertech Diamond 2 Stage issue

[Roadrace33]

I’ve never had this issue before. I just bolted together a new impact 737, 25x47 barrel, and Triggertech diamond 2 stage.

Every 7-8 cycles of the bolt, I get this odd trigger feeling where all of a sudden it’s not a 2 stage. It feels like a single stage, and then just breaks randomly. Like you go to pull for that first stage, and wham, it fires. I’ll attach a video somewhat describing it.
I’ve tried adjusting the weights much heavier with no luck. Tried a different bolt aswell.

I’ve got like 6 of these adjusted waaaay lighter than this, never a single issue.

Bad trigger?

 

[Roadrace33]

I was promised by a few friends this was a pull weight issue. However, I triple checked. I have adjusted 1st and 2nd stage multiple times, seperately, and the issue is still there. Sometimes it takes 20 cycles of the bolt, but it comes back no matter what. It seemed to go away when I tightened it up to like 3-4 lbs, it took about 60 cycles of the bolt, but I did have one instance with it tightened up that high aswell. So it seems it’s incorporated with something in the trigger that is tied to the weight of the adjustment.

Sent an email and the video to TT. I’ll stop at my local shop today and grab a new one, toss it in and see what happens. I assume it’s just a dud.

 

[Roadrace33]

Called TT. They told me to flush the trigger.
I stopped by my local guy, he just handed me a trigger to try. Same thing, 2 stage diamond. Tossed it in, dry fired about 20, then fired about 25 rounds. Then when I just was about to wrap it up, it did it again. So I stopped, thinking maybe, somehow it was an issue with a certain case or round somehow. Chambered a different round, and it was fine. So I re chambered the round that gave me the issue, and it was totally fine. So I don’t think it’s a case or round issue. So it seems as if it’s doing it less, but the issue is still there.

Kinda lost. Surely it can’t be an action issue? The pins slide right in the trigger hanger like they would normally. Visually, all the machining on the action looks perfect like the other impacts I’ve got. I’m missing something. I have to be.

 

[TahoeDust]

Do your run the same trigger in your other impact actions? Have you tried this trigger in a different impact action? I have a TT Diamond 2 stage in my Origin action and have not experienced this.

 

[Roadrace33]

Do your run the same trigger in your other impact actions? Have you tried this trigger in a different impact action? I have a TT Diamond 2 stage in my Origin action and have not experienced this.

This is my plan tomorrow. I have 4 impacts with this exact trigger, so I’m gonna try it. I love this trigger setup. Never had a single issue. It’s hard to believe it’s an action issue either, because what could be wrong? The trigger is sitting too low and it’s not getting reset perfectly? Maybe it’s as simple as that aluminum trigger hanger impact uses.

It is such a weird feeling because you’re expecting that initial take up of slack, and wham, it’s fired.

 

[1911Shootist]

I stopped by my local guy, he just handed me a trigger to try. Same thing, 2 stage diamond. Tossed it in, dry fired about 20, then fired about 25 rounds. Then when I just was about to wrap it up, it did it again.

So the symptom was present with both two different triggers?

What are the pull weights set at?

 

[jbell]

I feel like I had this happen several years ago with a Diamond and TT warranted it. I can’t remember what they said happened to the trigger, or if it occurred right out of the box or after some use. Sorry I am not much help other than to say give TT a call.

 

[Roadrace33]

I don’t have a gauge to check weight, but a good educated guess would be slightly over 1lb on both stages. It’s not very light at all.

Spent a good hour or two playing with it. I finally figured out how to replicate the symptom. If I slap the bolt down into battery somewhat aggressive, it puts the 2 stage trigger into this “position” that I’m dealing with that is not correct at all.
So I grabbed a second rifle. Did the exact same, slapped the bolt down, and there it was. Did the exact same thing. I grabbed a third rifle. Same thing. It’s really odd I haven’t noticed this until now. Immediately assumed it was a trigger problem. Why it’s doing it, I’m still unsure. Surely people run the bolt WAY harder than this. But, maybe there isn’t as many people running a two stage TT in an Impact.
I do completely understand that there is no reason to slap the bolt down like that, and during live fire I never do. This is however the only way I could seem to replicate the issue last night. I wasn’t about to pop a live round in and start toying with a trigger in my house last night.

A buddy of mine has an impact with a new TT diamond single stage. I seem to not be able to replicate the issue on his. However its single stage, so it would be hard to know.

I will attach another video describing. I have been toying around with a single stage Diamond for a little while. I do like it a lot. I originally made the switch to 2 stage when I got my first AI. (Now I have 2) I liked the idea of all rifles having the same concept of a trigger. However after this debacle, I’m really on the fence and leaning towards heading to my dealers shop after work and exchanging this 2 stage for a single and using it this weekend to see how it fairs against what I’ve been using the last few years, and also if I can get it to malfunction aswell.

I will attach a video of the issue in my new MPA vanquish and also my Samson. Same action same trigger same 75 degree bolt.

EDIT---I wonder if this could be a 75 degree bolt issue in conjunction with a 2 stage TT trigger. I bought my first 75 degree action and bolt a little while back and immediately loved it, and since id switched all mine too it the 75 degree. I sold my 2 original 90 degree bolts to a friend. I could easily borrow his tonight and try and replicate it....I really hope this is not the issue. I have a lot of rounds of the 90 degree bolts, and maybe only 3-400 with a 75 degree.. I fell in love with the 75 Degree immediately.