CZ75b trigger issue

GymB

GymB

Picking it up slowly.
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Fire gun, slide cocks hammer, round chambers, pull trigger, hammer drops, round doesn’t fire, primer isn’t marked. On subsequent events, fully release trigger, manually cock hammer and pull trigger, round fires as normal.

When I fully released the trigger between shots, no problem. When I was trying to minimize trigger travel was when I was getting the problem.

Thoughts?
 
It sounds like a timing issue to me. Like the firing pin block isnt clearing the pin before the sear releases the hammer.

Disclaimer: Im not a gunsmith, nor did I sleep in a Holiday Inn Express last night lol. Tagged so I can follow along and see what the problem/solution turns out to be.
 
Sounds like the firing pin block safety. It’s not disengaging on the second shot when you are only moving the trigger to the sear reset point but does disengage when you fully release the trigger - it has one of those doesn’t it?
 
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Thanks guys. I took the slide apart and cleaned it tonight thinking that firing pin block might be hanging up. Took more time than a detail strip, cleaning and reassembly of a 1911. Looking at the fire control cage I decided to wait until morning to tackle it, and then maybe I’ll just brake cleaner the heck out of it rather than trying to take it apart...it reminds me of an old tavern puzzle.
 
JimB said:
Thanks guys. I took the slide apart and cleaned it tonight thinking that firing pin block might be hanging up. Took more time than a detail strip, cleaning and reassembly of a 1911. Looking at the fire control cage I decided to wait until morning to tackle it, and then maybe I’ll just brake cleaner the heck out of it rather than trying to take it apart...it reminds me of an old tavern puzzle.
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Give me a call about an hour before you bust into it and I'll be happy to come by and look at it. I've torn them down a few times and know a few tricks.
 
Is this a new gun? I heard that CGW is seeing a lot of QC/QA issues with CZs coming out of the factory right now. Which is not usual. If it is a new gun I would contact CZ-USA
 
Old gun. Took the slide apart and cleaned it up, reassembled and same problem. Scrubbed and hosed out the frame with brake cleaner, looks great but didn’t get to shoot it yet. Maybe tomorrow.
 
JimB said:
Old gun. Took the slide apart and cleaned it up, reassembled and same problem. Scrubbed and hosed out the frame with brake cleaner, looks great but didn’t get to shoot it yet. Maybe tomorrow.
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Give CGW a call. They might be able to point you in the right direction.
 
wvsig said:
Give CGW a call. They might be able to point you in the right direction.
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Call them, I’m gonna send it to them to sort it out if it needs more than cleaning. Actually since it’s a range toy I may redo over the firing pin block and see if that helps.
 
JimB said:
Call them, I’m gonna send it to them to sort it out if it needs more than cleaning. Actually since it’s a range toy I may redo over the firing pin block and see if that helps.
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They have my 75B right now. They have not called me to talk the details of the build so it is not quiet my turn but it should be coming up any day now.
 
Okay, cleaning helped, maybe. The problem appears only after firing a few hundred rounds. At that point the pistol is becoming quite warm throughout and so maybe the heat is causing the problem. At around 350 rounds I start to get an occasional failure to feed when I release the slide using the slide stop, a quick tap and the issue is resolved.

Brought it home, but haven’t cleaned it. Will take it back to the range dirty and see if these problems immediately appear, if so are likely caused by being dirty, or if they only appear when the gun gets hot.
 
NoNameHaveI said:
View attachment 36623
Assuming a standard trigger and not an omega, if you look at items 14+15 in the above diagram, the fpb lifter spring is very small and if bent out of shape can stay that way, and cause the intermittent issue you are having.
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Thanks, rather than get that deep into it without being certain, can I just remove parts 58/59 from the slide? If that resolves the issue then I’ll know that the problem is one of four parts.
 
JimB said:
Thanks, rather than get that deep into it without being certain, can I just remove parts 58/59 from the slide? If that resolves the issue then I’ll know that the problem is one of four parts.
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I suppose you could, word of advice from someone who has been there, obtain a replacement firing pin retention roll pin(items 57a+57b) you will most likely ruin them getting them out. IMO it’s easier to examine the lifter, it should be right at the top of your sear cage , you can lift it with a pick or fingernail and see see the spring without taking anything apart.
 
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If you remove the firing pin retention roll pin using a roll-pin punch, (or a nail that fits) you shouldn't have any problems with breaking the roll pin. And if you have a Dremel or hobby saw, any hardware store will have a roll pin on hand that can be cut to length. (The one time I broke a firing pin retention roll pin the replacement pin from Ace Hardware cost me $.75 -- that beats paying CZ too much, when shipping is included, for a very inexpensive part.)

As I understand it, disabling the firing pin block system or removing parts of it, can -- depending on what's removed and how -- affect timing and mess with the trigger pull -- at least with the older (pre-Omega) design; I don't know whether that potential problem changed with the Omega design.

(Timing as affected by the firing pin block system is a couple of notches above my pay grade, but maybe someone else on the forum can address the possible consequences.)
 
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...At around 350 rounds I start to get an occasional failure to feed when I release the slide using the slide stop, a quick tap and the issue is resolved.
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That could be caused by something as simple as a new mag or a new stronger mag spring in an existing mag. Or a combination of new, stouter mag spring, and a slightly weak recoil spring. (Number your mags if you're using more than one, to see if the problem happens with the same mag.)

New or extra stout mag springs could explain the problem -- especially when paired with a slightly weakened recoil spring: the topmost round is pushing hard upward against the feed lips and also against the underside of the slide as the slide goes forward. Try it with maybe two rounds less when it happens next time, and see if that's solves the problem. If it is, the problem could be made better by leaving the mag fully loaded for a week or two. (This is especially true with hi-cap mags.) Or by trying a new recoil spring.

A lot of semi-autos just don't like chambering the top round of a fully-loaded mag...
 
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