April 3, 2004, 08:03 PM
I just purchased my first CZ today, a new CZ75BD in 9mm. It was a nice surprise to see a new gun come with a standard 15 round mag. I immediately took it to the range and put 250 rounds of defensive ammo through it (a mixture of +p124g Federal EFMJ, +p 124grain Speer GoldDot and +p 124 Grain Golden Saber). The gun had absolutely no malfunction with this ammo. Next I sent 200 rounds of standard pressure 115grain Winchester White Box down range. The slide prematurely locked back six times while firing the Winchester ammo. It happened 5 times with the 10 round mag and once with the 15 round mag. Each time I would hit the slide stop and continue shooting. Since I shot all of the +p stuff first, I am wondering if the gun just likes hot loads better or if it does not like to function properly when dirty. Has anyone had a similar experience with their CZs?

One more question please. The manual that comes with the gun covers all of the CZ75 models and says that you remove the firing pin by pressing in the firing pin and sliding down the firing pin stop, just like on a 1911. However, the version is have does not have a firing pin stop. Does any one know how to remove the firing pin from the BD version?

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Victor Romen
April 4, 2004, 12:10 AM
The manual is wrong. They are referring to the original CZ 75 and not the B model. You have to knock out a roll pin to take the firing pin out. It is best left alone unless you have to replace the firing pin. Always use a snap cap as well when you dry fire the gun. I broke a firing pin (had to knock the roll pin out), but CZ replaced it with no more then a three-minute phone call to them. Took my name and address and the firing pin arrived a couple days later in the mail. Cost me nothing at all. Didn’t like the fact that the firing pin broke, but the service more then made up for it.

I've never had a premature lock back problem before.

April 4, 2004, 09:58 AM

Thanks for the informations.

April 5, 2004, 10:38 AM
The premature slide lock might be due to the newness of the gun. I have shot my 75B till it was not only too nasty to touch, but too nasty to look at. Being dirty might not be the problem. However, did you clean it before you shot it? CZs usually come packed in oil, almost like tuna, and the excess oil might have caused more grit than usual to accumulate. And WWB is pretty dirty stuff. Clean it real good and try it again (Gives you a good reason to make another trip to the range, like you need an excuse.) Give it about 500-600 rounds to break in before you start to tinker with it or worry about it.

As far as hot loads go, the CZ's will eat them all day. Although like any gun, they will eventually take their toll. I wouldn't worry about it too much though. That being said, I haven't ever had a normal load cause it to go into slide lock. Not trying to delve into your personal life, but are you limp wristing?:D That might cause it.

Go shoot it again and let us know how it does. But remember, all of my information is worth exactly what you paid for it, and not a penny more.

Peace out,

April 5, 2004, 02:52 PM
The premature slide lock has been a "known" problem for some time. I thought it was fixed w some slide stop spring/slide stop changes. When were yours actually made (date is on the extractor)? Maybe they didn't get the fixes?

Both my "military" CZ75Bs did it. Not all the time, but more often than I liked, with Magtech, USA, American Eagle and Lawman ammo, and long after any reasonable break in period. Have seen other CZs do it, all made in the 90s.

Give CZ USA a call; they used to admit it, send ya the new spring no problem. Some slide stops needed a little work too, even after that.

April 5, 2004, 06:49 PM
I've never experienced any consistant problems with any of my 9mm CZs or EAAs... And I don't think I can ever recall a premature slide lock on a CZ personally but I do know that if CZ75s have a weak point, it's the slide stop. They are more prone to breakage than many other very compotent designs so early slide lock wouldn't surprise me too much.

Still, outstanding guns for the money. And in a defensive 9mm, I'd rather have a gun that was 100% with hot loads than a gun that was 100% with standard loads but failed with hot loads. Or said another way, I don't have a problem clearing a gun at the range as long as I don't have to clear it in an actual SD shooting.

Good luck and be sure to keep us posted.

April 5, 2004, 08:05 PM

I did clean off all of the oil that came on the gun and lightly lube it with FP-10 before going to the range. Also, I very well could have been limp wristing. I also took my new 2.5 inch S&W 66 and put over 200 125 grain magnum Gold Dots thru it. My hand was kinda numb by the end of the range trip. I will take only the CZ next time and pay more attention to my grip.


I also read about the spring changes, especially magazine springs, might fix the problem. I ordered a 16# recoil spring and +10% mag springs from Wolff today. I might hold off on changing the recoil spring but the magazine springs seem a little weak.

I still this will be a very easy problem to workout. Overall, I am pleased with this gun and plan to hold on to it. I definitely see why CZ owners really like them.

Walt Sherrill
April 5, 2004, 08:29 PM
Premature slide lock in a CZ (or in any gun) can have a lot of causes:

1) Weak mag springs. Not likely with a new gun, unless the mags you're using are after-market mags. A weak mag spring will let the top-most round slide around as the slide slams forward, and it can be in position to nudge the slide stop.

2) Weak slide stop spring, or one that's bent out of shape. CZ's gunsmith typically tells folks to replace the spring or to bend the end so that the spring puts more pressure on the slide stop (which keeps it from moving until its PUSHED UP by the mag follower.)

3) Out of spec ammo.

4) Out of spec slide stop. (Had this happen with a CZ-85 Combat; had to take some metal off the face of the slide stop where it is lifted by the follower. Bullet noses were nudging it as they came up the tube.)

5) Bad mags that aren't to spec. Again, not likely if your're using factory mags and they're new, too.

6) doing something unplanned with your off hand, while firing.

One and two are the most likely suspects.

April 6, 2004, 07:45 AM
As far as the slide lock back is concerned........give your gun a chance to mate its surfaces and replace the recoil spring. If that doesnt fix it then play with your slide stop...but Ill bet you dont need to. Its been a common thing with the newer guns Ive had to.....CZ's.
Shoot well.

April 6, 2004, 10:31 PM

I plan on putting another 500-600 rounds thru it and seeing what happens. I really like the feel of this gun. Once I get it shooting reliable, I will be looking for a good leather IWB holster for it. Know where I might get one.

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