CZ 858 Trigger issue

Dmitri

Dmitri

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Friend of mine just bought his first CZ recently, and yesterday we went to the range to try it out...it shot 13 rounds and after it would fail to fire, we tried to field strip it to see whats wrong, but the back cover wouldnt even open because the bolt was cocked, and pressing a trigger didnt release it... So after 20 minutes of jerking the bolt back and forth..trigger actually worked, released the bolt, and we were able to open the cover and take the bolt assembly out and have a look...

Never mind .. Just another GREMLIN.. :( or .. maybe NOT.. :)



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Just for some additional background info - I'm the original owner of the rifle, the rifle is from the first batch of Wolverine imports, has had about 400 rounds of czech surplus through it, and never had a ftf/fte or any other issue to date.
 
I had the exact same problem as you (before the edit) and I don't think it's a gremlin.
the good news are:it's an easy fix. Just add a washer (22 brass?). Problem solved for me.
 
ok it is fixed now... hopefully for ever.. :) Check this out this might be the quickest and easiest way to fight the gremlin... Correct me if i'm wrong...
Gremlin.jpg
 
I did almost the exact same fix to mine. I put my shim (piece of brass cut from a 9mm case) on the other side of the bushing.
 
well if it is not a gremlin... then what is it..? what is it caused by ? does every CZ 858 need s this fix eventually...? i'm asking cause mine doesnt have this issue yet, however
maybe i should just fix it any way may be it will prevent the appearance of a real Gremlin.. :)

And BTW... isnt this the same problem as one that X-Man mentioned in Gremlin Thread....?
Xman said:
I was thinking about this today and after taking the trigger and sear apart, I think that what you actually need to do is add material to the trigger lip that hooks the sear rather than file some off.

A little material should be added at the end that is closer to the chamber. That way, when the sear is pushed down by the striker nose, it will not get hooked as soon. The sear reconnects to the trigger as soon as the sear heel passes beyond the little connector lip and gets hooked on its forward edge as the trigger spring pushes the connector upwards as soon as there is nothing in the way.

If that edge was further to the front, it would take the sear heel a little more traveling to get hooked on it, which means it would have to be pushed a little deeper. That's not likely to happen so the failure won't occur.

When the trigger is released after each shot, the top part of the trigger group move towards the back of the rifle and eventually the edge of the lip hooks the heel of the sear.

So, in conclusion, a different way to fix the gremlin would be to add a little material to the front of the connector lip.

I wonder if solder would be strong enough...

searandtriggerkd1.jpg
Click to expand...
 
Dmitri said:
well if it is not a gremlin... then what is it..? what is it caused by ? does every CZ 858 need s this fix eventually...? i'm asking cause mine doesnt have this issue yet, however
maybe i should just fix it any way may be it will prevent the appearance of a real Gremlin.. :)

And BTW... isnt this the same problem as one that X-Man mentioned in Gremlin Thread....?
Click to expand...

On the full-auto version there is another sear instead of that bushing we've all shimmed. The crappy bushing allowing the sear pin to shift and thus the sear to elude the trigger connector is the problem.

Now I might be ostracized for saying it, but I've yet to hear a reasonable explanation for the gremlin and I personally think it's related to "pin-slop". Either on the sear or trigger pin. Or caused by the installation of worn surplus trigger parts at the factory.

This business of tabbed carriers seems like building a big awning over your leaky roof instead of getting it reshingled. :confused:

Although, if someone knows better and can clearly explain it to me, I would welcome the knowledge.
 
Exoce† said:
On the full-auto version there is another sear instead of that bushing we've all shimmed. The crappy bushing allowing the sear pin to shift and thus the sear to elude the trigger connector is the problem.

Now I might be ostracized for saying it, but I've yet to hear a reasonable explanation for the gremlin and I personally think it's related to "pin-slop". Either on the sear or trigger pin. Or caused by the installation of worn surplus trigger parts at the factory.

This business of tabbed carriers seems like building a big awning over your leaky roof instead of getting it reshingled. :confused:

Although, if someone knows better and can clearly explain it to me, I would welcome the knowledge.
Click to expand...



I think you are right, my cz 858 has 400 rounds through it and then it would not fire, trigger was sloppy, I push the trigger pin on the right side of the receiver and it would work agian also when pulling the trigger back and right it would always fire but pull the trigger left it would not release the striker.

Trigger pin assembly moves bout 20 thousands of an inch causing my issue.
 
Dmitri said:
ok it is fixed now... hopefully for ever.. :) Check this out this might be the quickest and easiest way to fight the gremlin... Correct me if i'm wrong...
Gremlin.jpg
Click to expand...

Thanks for posting pic.

I just checked mine... I have no gap there; I could not fit a washer of any type in that area. Tolerances?
 
westwest said:
I think you are right, my cz 858 has 400 rounds through it and then it would not fire, trigger was sloppy, I push the trigger pin on the right side of the receiver and it would work agian also when pulling the trigger back and right it would always fire but pull the trigger left it would not release the striker.

Trigger pin assembly moves bout 20 thousands of an inch causing my issue.
Click to expand...

My czh2003 sport just started doing that too. :(
Trigger pin moves out a bit and the trigger stops working...push it back in and it's fine. Haven't figured out how to fix the pin drift yet.
 
Pin shouldn't drift.
There should be a lever on the side of the receiver (inside) that prevents this, no?
Check to make sure it is in the "Down" position and indeed blocking the pin from drifting.
 
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