How to id the source of malfunctions?

B

baddarryl

New member
Hi all. I got a 90's era CZ75B a few months back. It is very clean, but may have been shot a lot. I really don't know. It came with 4 mags.

I first id'd one mag that wouldn't allow the full trigger reset for some reason, but couldn't remember which it was. I shot a match today and found it first thing! Well I threw that in the bag and survived on the other 3. I think I ended up with one jam and then a couple of light strike misfires after that. I was using WWB 115gr ammo.

I decided to switch to some Federal Champion 115gr RN that I had. It ran fine on that, but only for about 30 more shots. All of this was in the heat of competition so not really an evaluation session. My hunch is it didn't like the WWB, but I do believe these guns are reliable and usually eat anything. My Glocks and Ruger run fine on the WWB. I did clean it and strip it before this match.

How would you approach this? Dang I need to start reloading! Thanks.
 
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We're gonna' need a lot better information in order to try to help.
Can you bring the gun to the keyboard?
Sometimes a direct conversation is best. :)
 
Mark your mags so you can identify any with a problem.

Has trigger work been done on the pistol? Did the light strikes occur DA or SA? A lighter-than-stock hammer spring eases the DA trigger pull, but can cause light strikes on hard primers.
 
I did ID the one mag and set it aside. I have no idea if the trigger has been worked. It may have as there is skateboard tape on the grip and a non enthusiast I feel is unlikely to do that. If one is, than a trigger job is certainly not out of the question. The SA is right at 7 and the DA is about 9 according to my trusty fish scale. Makes sense as it is slightly heavier than my Range Officer which is about 5.
 
7 lb SA pull? Sounds a bit high, even for a stock gun. Suspect you have
something dragging or out of time.
 
Alaways, always start with the mags first and go from there. Great suggestion from Limnophile about labeling the mags so you are certain what is what.
 
The 7lbs your fish scale is showing might not be unusual.
That's only 2 lbs or so over the usual.
And can easily be explained by just where the fish scale was attached to the trigger.
But in conjunction with all the other symptoms, there could be a problem.
Unfortunately, the CZ75 is kind of complicated design with lots of small parts and springs.
To diagnose it and fix it will require an education process.
Otherwise, it would be better to find a gunsmith who is familiar with it.
Probably not the answer you wanted, but with a malfunctioning used gun of that age, it could be anything at fault.
 
Factory mags sold by CZ-USA are good, as are Mec-Gar mags.

A 9-lb DA trigger is light for a new CZ 75, which I seem to recall is 12 lb or more. They do improve with use, but by how much I don't know. An aggressive trigger job can reduce the DA pull to about 6 lb as I recall.

Another thing to consider when getting light strikes, per the Instruction Manual, is to check that your firing pin isn't gunked up.
 
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