Author Topic: "New" CZ100 - Thank you!  (Read 3583 times)

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"New" CZ100 - Thank you!
« on: January 29, 2009, 10:07:28 PM »
I want to thank all of you who have shared your trigger and tune-up tips.

Last weekend - acquired a CZ100, in .40 S&W. I hadn't studied up on it beforehand  (mistake); but the price seemed reasonable, given the overall reputation of CZ products.  Saturday and Sunday afternoons, I read everything I could about the model. It seemed that the preponderance of opinion was favorable.

By Tuesday afternoon, I was seriously concerned that the detractors were right!

The trigger was gritty; the magazines (it came with two for the price) wouldn't reliably seat when full, and wouldn't fall freely from the mag well unless empty. That wasn't enough, about every fifth shot, the slide would lock open even though there were still cartridges in the magazine.  No jams, or stovepipes, just locked open - a pull on the slide would release it, and it was good for a few more shots.

After a few hours of diagnosing, I discovered two of the problems were related. The top round of the magazine was impinging upon the slide stop tab. The round was binding on the tab if a non-empty magazine was released, and the second round was partially lifting the tab as it rose to replace the round being stripped out of the lips.

I looked at the exploded diagram, and the tab appeared correct, but it was clearly interfering with two different profile bullets.  First, I started with reshaping the tab to clear all the available bullet profiles, while endeavoring to leave the forward part of the tab as long as possible - to insure correct operation by an empty mag.

That done, I started on the trigger.  I stuck with my "Arkansas" stone, rather than sand paper.  The trigger bar cleaned up rather easily, but I think I will ultimately need to replace the trigger bar disconnector. The camming surface seems to have a groove in it, possibly worn in due to inadequate lubrication - this despite the appearance that it had hardly been fired, except that the inside was rather dry. Does
CZ ship these things with no or very light lube?

I lubed most everything with Dri-Slide, but used gun grease on the camming face of the trigger bar and disconnector.  Result?  The trigger isn't bad for a DAO, I guess, but still not as good as the factory job on my Rossi .44.

After the trigger job, I could observe a clear tendency of the barrel to twitch rightward right after the break. No it wasn't just me. I'd read about the "eraser" trigger stop, and started looking around for a suitable material. I ended up with a bit of tire tread from an old tire I hadn't yet junked. I would have liked for my trigger stop to be a Michelin, but I had to settle for a Dunlop.

In the end, I still don't know if most CZ100s required so much gunsmithing to make them reliable, but this one has a "B" serial number that is less than 100. I'm going to assume that it was just a lemon. I would certainly have hated to pay a professional gunsmith for all this work on top of the purchase price. I suppose that's why the guy sold it.  >:(

Oh, yes - and the magazine seating problem? I took about 1/64" off the bottom of the grip - end of problem.

Again, thank you,

Offline Old Coastie

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Re: "New" CZ100 - Thank you!
« Reply #1 on: January 29, 2009, 11:46:55 PM »
Congratulations on your purchase and welcome to the asylum. Based on your description of your trigger work to date, you are about half way to the best double action trigger of your life.

If you want a trigger that will equal a fine S&W, you have some more work ahead. The short version is to completely disassemble the pistol, down to the very last part. Then polish and de-burr anything that moves during the action of pulling the trigger, including the springs. You will not believe the difference it makes. I did it because that's the way I am, and it is a very easy pistol to work on.

If you are happy with the trigger pull now, wonderful. What is important is that you are confident that it will do exactly what you expect every time. I have found that the longer I have my 100's, the more I like them.

Keep in touch and good shooting.
Just because you're paranoid, it doesn't mean they're not really after you!


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Re: "New" CZ100 - Thank you!
« Reply #2 on: March 21, 2009, 09:48:35 PM »
I agree with Old Coastie. A good trigger work will equal your pistol trigger to a fine S&W !
At the gunshop where I bought my CZ 100 , they advice me to put some profesional trigger work on my CZ 100 before firing the very first round , and that's exactly what I did , so I can't say anything about the "before" trigger condition on my pistol.
My shooting partner bought a CZ 100 and he let me shoot a few rounds with it. Let me tell you the trigger was a nightmare , but polishing all the moving parts of the trigger mechanism was the magic solution ; now is just like a whole different pistol. Instead of looking for a pro gunsmith my friend did the job himself.
I haven't experimented any magazine problems after 375 rounds on my gun.

Keeping in mind that my CZ100 was so easy on my wallet , paying a pro gunsmith for a trigger job didn't hurt that much. It was worth the time and money spended ; all in all I am very happy with the little Ceska ...

Offline PDTACF

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Re: "New" CZ100
« Reply #3 on: May 25, 2009, 11:35:12 PM »
I recently purchased a 9mm CZ-100 from SOG.  I figured that since they were out of production this was the time to add it to my collection.  This weekend I managed to get to the range and I must say out the box it was dead on.  Even with the mile long trigger pull I still managed to put up some nice groups.  Also, I thought the square sights were easy to align and the grip angle was good.  Excellent gun, not a 75, but fun and different to shout.