Help me trouble shoot a trigger

[SABuzzard]

Replaced the stock mil-spec hammer on a CMMG dedicated 9mm AR lower with a Geissele Super Dynamic 3 Gun trigger. The rifle fires, ejects the spent case, chambers a fresh round, but does not cock the hammer.

CMMG says their ramped bolt works with standard AR hammers. I double checked the one that I removed from the rifle and it's identical to a regular mil-spec trigger on a 556. So nothing special there.

Anybody have experience with this type of set up or recognize this type of problem?

 

[trident1982]

Re: Help me trouble shoot a trigger

numerous folks have had issues with the 3G triggers when first getting them...this is primarily due to the fact that the trigger is just a completely different animal than most shooters have ever tried before. It's so fast, so light, and so smooth that follow through, and shouldering the rifle well is critical to maintaining either control, or 100% functionality out of these units.

regardless if the problem is a reset issue, bump fire issue, or otherwise issue, the solution is pretty universal....which is to go with a heavier spring than the one that used to at least come factory with these triggers....3.5lb. If you don't have the gold colored spring installed, than that should be your first step, along with paying close attention to your follow through, and the way in which your shouldering the rifle.

 

[SABuzzard]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: trident1982</div><div class="ubbcode-body">numerous folks have had issues with the 3G triggers when first getting them...this is primarily due to the fact that the trigger is just a completely different animal than most shooters have ever tried before. It's so fast, so light, and so smooth that follow through, and shouldering the rifle well is critical to maintaining either control, or 100% functionality out of these units.

regardless if the problem is a reset issue, bump fire issue, or otherwise issue, the solution is pretty universal....which is to go with a heavier spring than the one that used to at least come factory with these triggers....3.5lb. If you don't have the gold colored spring installed, than that should be your first step, along with paying close attention to your follow through, and the way in which your shouldering the rifle. </div></div>

Wow - ok... so even if properly installed this trigger requires technique/practice to make it work?? If that's the case then I need to look at other options. I want to be able to have a new shooter pick up this rifle and have it 100% reliable.

I'll try the heavier spring as well. See if that makes a difference.

 

[Ballista One]

Re: Help me trouble shoot a trigger

The SD3G is a NO GO in a blowback carbine. The timing of the trigger is short to function properly.

 

[trident1982]

Re: Help me trouble shoot a trigger

That's why these 3G triggers were designed specifically for gaming or 3gun competition. They are not suited in the least for any duty, hd, pd, or otherwise serious use rifle. GA will be the first to tell you that these triggers are very radical, and should be avoided when choosing a trigger for a "duty" rifle.

Can one shoot precisely, or in a stressful situation with 3G triggers....absolutely, but one could also just as easily send a burst downrange on accident if they don't have the rifle secured properly, and they initiate a bump fire sequence from a 3G trigger.

 

[SABuzzard]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SABuzzard</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: trident1982</div><div class="ubbcode-body">numerous folks have had issues with the 3G triggers when first getting them...this is primarily due to the fact that the trigger is just a completely different animal than most shooters have ever tried before. It's so fast, so light, and so smooth that follow through, and shouldering the rifle well is critical to maintaining either control, or 100% functionality out of these units.

regardless if the problem is a reset issue, bump fire issue, or otherwise issue, the solution is pretty universal....which is to go with a heavier spring than the one that used to at least come factory with these triggers....3.5lb. If you don't have the gold colored spring installed, than that should be your first step, along with paying close attention to your follow through, and the way in which your shouldering the rifle. </div></div>

Wow - ok... so even if properly installed this trigger requires technique/practice to make it work?? If that's the case then I need to look at other options. I want to be able to have a new shooter pick up this rifle and have it 100% reliable.

I'll try the heavier spring as well. See if that makes a difference. </div></div>

Turns out there's more to this story than the 3G trigger being a new/radical style that takes time to get used to. I'm amazed a Geissele's customer support. Specifically Bill Geissele. He exchanged emails and offered advise throughout the weekend and after hours! We're trying out a couple different things including a new 3G trigger just to confirm that there's not a quirk with the first. He wasn't concerned that this was a dedicated 9mm (blowback). So I'll post back once we figure it out or give up and go to another trigger. Oh and yes I agree that the 3G is not for duty use. I'm looking at this rifle for fast fun steel shooting on a private range (farm).

 

[Ballista One]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SABuzzard</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SABuzzard</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: trident1982</div><div class="ubbcode-body">numerous folks have had issues with the 3G triggers when first getting them...this is primarily due to the fact that the trigger is just a completely different animal than most shooters have ever tried before. It's so fast, so light, and so smooth that follow through, and shouldering the rifle well is critical to maintaining either control, or 100% functionality out of these units.

regardless if the problem is a reset issue, bump fire issue, or otherwise issue, the solution is pretty universal....which is to go with a heavier spring than the one that used to at least come factory with these triggers....3.5lb. If you don't have the gold colored spring installed, than that should be your first step, along with paying close attention to your follow through, and the way in which your shouldering the rifle. </div></div>

Wow - ok... so even if properly installed this trigger requires technique/practice to make it work?? If that's the case then I need to look at other options. I want to be able to have a new shooter pick up this rifle and have it 100% reliable.

I'll try the heavier spring as well. See if that makes a difference. </div></div>

Turns out there's more to this story than the 3G trigger being a new/radical style that takes time to get used to. I'm amazed a Geissele's customer support. Specifically Bill Geissele. He exchanged emails and offered advise throughout the weekend and after hours! We're trying out a couple different things including a new 3G trigger just to confirm that there's not a quirk with the first. He wasn't concerned that this was a dedicated 9mm (blowback). So I'll post back once we figure it out or give up and go to another trigger. Oh and yes I agree that the 3G is not for duty use. I'm looking at this rifle for fast fun steel shooting on a private range (farm). </div></div>

Your issue more than likely has to do with the angle and length of the cocking surface on the bolt. I hope a different trigger solves your problem but I'm betting against it. Bill and his crew provide great follow up service and the success of his business clearly shows they make a great product.

 

[SABuzzard]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: m_gale</div><div class="ubbcode-body">

Your issue more than likely has to do with the angle and length of the cocking surface on the bolt. I hope a different trigger solves your problem but I'm betting against it. Bill and his crew provide great follow up service and the success of his business clearly shows they make a great product. </div></div>

You're absolutely right. We've identified that the 9mm bolt is a hair narrower than a "traditional" 556, but Bill and team are sticking with it and looking for solutions. I'm really impressed. Most other groups would have just said something like "we don't support that" and sent me on my way.

 

[SABuzzard]

Re: Help me trouble shoot a trigger

We couldn't get the Geissele tigger to run. Bill Geissele gave it his best. I'm amazed at the efort/energy he put into tying to figure this out. Great customer service! I've since installed the trigger in another rifle. Works perfectly - love it.

I then moved onto a RRA 2 stage. I tried it mainly because I had it laying around and I wanted to see if something different would work. No luck. Worked better than the Geissele, but was still a 50% deal.

So I guess I'm suck with the factory mil spec FCG. Anybody have ideas or able to share experiences?

 

[insight3b]

Re: Help me trouble shoot a trigger

Since the instructions say to use a standard hammer that is what I would do(which is what you did LOL) If I was in your shoes I would have a 3g trigger laying there begging to built into a new rifle

 

[BDHershey]

Re: Help me trouble shoot a trigger

Maybe an ALG trigger would provide you with the improvement over mil-spec that you are looking for while still providing the reliability of a mil-spec unit?

 

[SABuzzard]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: insight3b</div><div class="ubbcode-body">I would have a 3g trigger laying there begging to built into a new rifle </div></div>

That's what I'm afraid of

This build started because I had a free-float tube sitting around

 

[SABuzzard]

Re: Help me trouble shoot a trigger

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RD62</div><div class="ubbcode-body">Maybe an ALG trigger would provide you with the improvement over mil-spec that you are looking for while still providing the reliability of a mil-spec unit? </div></div>

Thanks - good idea. Not exactly the 3G, but much improved over stock.