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CZ75b Omega trigger reset issues and weirdness. Experts please help Login/Join 
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I'm posting this here in hopes that I reach someone knowledgeable. I've asked at the CZfirearms.us forums and I've asked CGW and have been given some good advice but nothing has fixed the issue yet.

Background:
I wonder if you folks can help me with an issue I'm having with failure to reset ( NOTE: there were hints of this issue before I installed the CGW 75700 Omega kit so I don't think it's an issue with CGW parts, which appear to be excellent and really transformed both DA and SA trigger).

I beg your patience while I go over some history that may or may not help you more knowledgeable people diagnose my problem.

I have an original type CZ75B Omega, with the black curved trigger and the standard non-convertible safety. I got it second hand, and it looked as new. (FWIW I spoke to CZUSA about my issue and they were friendly but said it was out of warranty and I’m not the original owner so they’d have to charge me $120 to look at it, plus whatever work and parts. I’m fairly handy with tools and minor gunsmithing and I prefer to solve problems myself if possible.)

I initially had an issue where the OEM unmodified pistol would sometimes fall to the half-cock notch from the DA stroke, or fail to ignite primers. Not every time, but it did it both in dry and live fire.

I called David at CGW after he offered help on another forum and he asked me to send him my hammer which he did, and he modified it and sent it back no charge, which was super cool. It seemed to fix my issue, but the half-cock no longer functioned (when lowering the hammer slowly with finger off the trigger, the hammer fell all the way to the resting position, and when cocking the hammer slowly there was no half-cock position).

I shot a few magazines through it but it started failing to ignite primers in the DA stroke, and many of them had zero contact with the firing pin. The trigger also seemed to have a sluggish reset at times... like it didn't want to reset but it still did (see below).

I decided to try the CGW 75700 Omega kit to see if a new hammer/firing pin/disconnector/springs/whatever would fix my weird non-functional pistol. (I mention the above only because it may help you diagnose whatever other issues my pistol may have.)

The CGW Omega kit went in without issue, and I shot a few magazines DA and SA without problems. The DA stroke is much smoother and a couple lbs lighter, and the SA is exactly what I was looking for, very crisp 4 lbs, short break with minimal overtravel and a great reset. I used the white sear spring.

HOWEVER then I started having failures to reset, particularly after a DA shot. The trigger doesn't reset, but if I put a little pressure on the back of the trigger it clicks and resets.

I would really prefer to fix this issue myself if possible. I've READ about some people having issues with reset caused by a bent trigger bar (they said). I've also read that Mec-Gar mags can cause some sort of damage or bend the bar or spring (I have a couple mec-gar 16-round mags and a couple OEM 16-round mags, and a 17-round ACT mag). I've read somewhere that CGW says that if your OEM roller is over a certain size I need to call CGW. My OEM roller was .2395" but now the 75700 kit roller is installed. I can’t find the source of that info now.

I've also read that trigger reset issues can be caused by the trigger bar spring not fully resting in the groove on the bottom of the trigger bar. Mine appears to be where it's supposed to be.

Anyway, any expert ideas are more than welcome. I replaced the trigger bar and it worked for 12 rounds and then started to feel rough and then stopped resetting? Should I replace the sear? (does that even come into play here?) Any other ideas for stuff I should try?

Here's a video of the issue if it helps.
https://youtu.be/m8p2diNOU5Q

So... more mysteries. I ordered a new trigger bar and installed it today, along with the OEM trigger return spring just in case. Initial feel was excellent, everything functioned and reset okay when dry cycling. Took it to the range, loaded a full 16-round mag, and the first few shots felt great. Then with each subsequent shot I could tell the reset was getting rougher and by the last 2 shots, failed to reset again.

I'm at a loss... what else could the problem be? It's obviously something that gets exacerbated by recoil/live fire. Has anyone ever heard of an issue like this? It's driving me CRAZY.


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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I don’t have an Omega, but the regular decocker SP01, P01 and a couple other CZ’s. They seem pretty similar other than the sear cage area.

One thing I noticed on my TSO was crud from firing would get between the trigger bar and frame and drag. Especially on the TSO with a light return spring, it would keep the trigger from resetting even after only a magazine or two. It would get crunchy as well.

My initial fix was to just squirt some oil in there. later I pulled the trigger bar and hit it with some 600grit sandpaper to smooth the finish down. Then some more oil, I use either Lucas or Slip EWL 30. Tt’s worked fine ever since.

I see you put an OEM trigger return spring in.

I’ve learned all my CZs like plenty of oil. Dry, the Shadow 2 and the TSO have issues. I’ve not shot the SP01/P01 enough to dirty them. I expect they may do slightly better without the same amount of oil.

I highly recommend the Cajun Gun Works floating trigger pin as well. The factory tube was hard to keep in place after removing. It would walk out.

Check this out if you have not: https://forums.brianenos.com/t...ith-professor-atlas/




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Posts: 7489 | Location: West | Registered: November 26, 2002Reply With QuoteReport This Post
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Thanks for the ideas. It’s clean and well lubed. It feels obviously mechanical to me. I wondered if the issue is compounded by the single sided trigger bar of the Omegas.


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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The TSO has a single side trigger bar as well. I never thought to lube it.

You may look into the disconnector.
https://forums.brianenos.com/t...-czc-trigger/page/3/

This mentions it but I would think if it’s mechanical it wouldn’t work for a few rounds then get worse. To me it seems like fouling or you’ve got a pin that’s loose.




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Posts: 7489 | Location: West | Registered: November 26, 2002Reply With QuoteReport This Post
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I had the same issue with my P09. This da roller had too much play and I needed the next size up. Been 100% ever since.
https://cajungunworks.com/prod...on-roller-for-omega/
 
Posts: 8709 | Registered: January 04, 2009Reply With QuoteReport This Post
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quote:
Originally posted by Ryanp225:
I had the same issue with my P09. This da roller had too much play and I needed the next size up. Been 100% ever since.
https://cajungunworks.com/prod...on-roller-for-omega/
this is encouraging. The 75700 kit comes with the CGW roller but I assume they sell different/larger sizes? That link appears to be one size fits all. Thanks so much!


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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quote:
Originally posted by Riley:
The TSO has a single side trigger bar as well. I never thought to lube it.

You may look into the disconnector.
https://forums.brianenos.com/t...-czc-trigger/page/3/

This mentions it but I would think if it’s mechanical it wouldn’t work for a few rounds then get worse. To me it seems like fouling or you’ve got a pin that’s loose.

Like maybe the sear pin?? Can’t think of what other pin would matter. It appears to be snug. The OEM. disconnector and OEM guts never actually failed to reset but it acted like it was going to, and the trigger was basically unshootable stock. The CGW did include a new disconnector and lifter as well as the hammer. I wonder if you can use the OEM disconnector with the CGW hammer.


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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A disconnector or to hammer pin or hammer to strut pin, probably unlikely.

I still lean toward trigger bar drag, but I'm not familiar with the roller. You may have gotten a P09 roller in the kit on accident, it may be worth it to buy a roller specific to your gun.

If it was my gun, I'd disassemble, hit all the spots that might rub with fine sandpaper to make sure there was no excess finish or oddities. Lube the sear cage area with light grease, lube between the trigger bar and frame with a medium to heavy oil.

I would not mix stock and CGW parts at this time.

One other thing I came across, https://forums.brianenos.com/t...using-reset-issues/, the MecGar mag was slightly off and caused issue. Try it empty with a an empty mag in and see. Try different mags.




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Posts: 7489 | Location: West | Registered: November 26, 2002Reply With QuoteReport This Post
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https://czfirearms.us/index.php?topic=74902.0




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Posts: 7489 | Location: West | Registered: November 26, 2002Reply With QuoteReport This Post
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quote:
Originally posted by Riley:

One other thing I came across, https://forums.brianenos.com/t...using-reset-issues/, the MecGar mag was slightly off and caused issue. Try it empty with a an empty mag in and see. Try different mags.

FYI there's no sear cage on the Omegas. Trigger bar is clean and lubed and seems to be moving freely. I have an inquiry in to CGW about the 75700 roller diameter and whether they offer larger ones.
I am using OEM mags exclusively until I get this sorted. thanks for the help!


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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FWIW I heard from David at CGW and he wants me to send it in for diagnosis and hopefully repair. I think that’s the best way to go at this point. Will update if/when a solution is found. I’m VERY curious what the issue turns out to be.


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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Please let us know what he finds.
 
Posts: 8709 | Registered: January 04, 2009Reply With QuoteReport This Post
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I've seen this issue before in a rental gun at Shoot Point Blank-Grove City, Ohio (I worked there for a month) Someone showed the range owned gun to me on the shooting range. It worked perfectly in DA mode. But S/A mode it would do this exact thing. I've never owned a CZ gun before so I was unable to explain the issue. At the time I chocked it up to a range dirty gun.


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Posts: 7555 | Location: C-bus, Ohio | Registered: December 17, 2004Reply With QuoteReport This Post
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Well it’s on its way to CGW so hopefully they can sort it. Will update.


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Posts: 2216 | Registered: February 27, 2013Reply With QuoteReport This Post
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I vote for an issue with the Trigger Bar Spring, or the groove that it rides in.


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