Author Topic: Why does the Slide Stop go Bad on a CZ75 style guns?  (Read 11494 times)

0 Members and 1 Guest are viewing this topic.

Offline TXkid

  • Newbie
  • *
  • Posts: 2
Why does the Slide Stop go Bad on a CZ75 style guns?
« on: December 06, 2009, 06:44:43 PM »
I am a happy Shadow owner and have been reading up regarding the CZ75?s that the slide stop shaft braking.
I have s friend that in the past used a CZ75 in USPSA for 4 years until the frame cracked around the slide stop shaft hole.
I haven?t had my Shadow for long but I do have concerns since I am using it for USPSA.
I don?t want the frame to crack after the warranty expires and I like to know why the slide shaft cracks.
My suspension was the when the gun goes from slide back to battery the slide stop shaft is used to push up the barrel in to the slide lugs.
And to gain accuracy of the pistol the slide and the barrel need to be tight but I like to ask other opinions and if it is ok to shave off some of the metal under the barrel were it contacts with the Slide Stop shaft to relief some of the pressure? ???

I like to hear from some of the specialists out there what you think the cause and if there is a solution.

Thank you :D

Offline mountaincoulee

  • Full Member
  • ***
  • Posts: 123
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #1 on: December 06, 2009, 11:15:38 PM »
The relationship between the slide stop shaft and the curved barrel lug slot is critical to the timing and extent of the barrel lug lockup. If you remove material from either one you will mess up your gun's funtionality, or injure yourself/others.

I am content with simply cleaning and greasing those surfaces, in the hope this reduces impact wear.

I've been advised to purchase a replacement slide stop and keep it in my range bag.

Offline Mikke

  • Jr. Member
  • **
  • Posts: 70
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #2 on: December 07, 2009, 01:56:19 PM »
Don't worry. It's extremely unlikely you will crack the frame itself.

You might break the slidestop itself if you shoot a lot of hot loads, buy one to keep as a spare, and don't worry about that either. Do not remove any material!

I thing I have shot less then 3000 rounds through my Shadow so far (though I bought it used, but I doubt the previous owner had shot more then a couple thousand), and I'm still on my first slidestop, and no cracks whatsoever (and haven't heard of any on a Shadow). My old CZ-75 have more then 18 000 rounds through it, quite a lot of it my handloads, 124gr @ around 1250fps, and 95gr @ around 1360 fps. So far I have broken the slidestop twice on that one... (Second time probably thanks to 124gr FMJ @ 1320fps)
/Mikke
(aka Mikke_EAF331)

Offline TXkid

  • Newbie
  • *
  • Posts: 2
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #3 on: December 07, 2009, 03:34:32 PM »
Mountaincoulee & Mikke
Thank you for the reply and from reading it I will follow your instructions.   :D
I really didn?t want to change anything on the gun and mess up the function and the safety.
That is the last thing I want to do.
I guess I will keep my loads low and get a second backup Slide Stop; I got one from CZ the other day with other parts.

Just for curiosity can you tell me if the linkage of the barrel being tight in battery is the case of the Slide Stop Shaft breaking or something else?  ???
Since I recently got the CZ I have never seen one.
So I am just guessing from what my buddy told me and when I remove the slide stop and reinsert it in to the gun having the thumb release pointing down (parallel with the trigger)
It is very tight and I can feel the barrel linkage pushing down on to the Slide Stop Shaft
If that is the design of the gun I can argue but it seems to me to be too tight not snug fitting.

I Love my M&P 40 and my STI Open gun but the CZ tops it off.

Offline mountaincoulee

  • Full Member
  • ***
  • Posts: 123
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #4 on: December 07, 2009, 06:10:56 PM »
If you're reloading for competition -as in bullseye, IDPA, IPSC and variants thereof- there is no advantage or need of a 'hot load', provided you make minimum Power Factor. A hot load means the gun recoils more, and takes more time recovering to where you can reacquire the sight picture-this slows down your run. If your application is SD, ammo for that is 'hotter' but not 'crazy hot'.

I chronoed some Police 9mm ammo in my Shadow and iirc, it came in at a power factor in the 170s. I don't remember the velocity. There definitely was a stronger recoil impulse.

Quote:
"Just for curiosity can you tell me if the linkage of the barrel being tight in battery is the case of the Slide Stop Shaft breaking or something else?  
Since I recently got the CZ I have never seen one.
So I am just guessing from what my buddy told me and when I remove the slide stop and reinsert it in to the gun having the thumb release pointing down (parallel with the trigger)
It is very tight and I can feel the barrel linkage pushing down on to the Slide Stop Shaft
If that is the design of the gun I can argue but it seems to me to be too tight not snug fitting."


Now I'm no 'specialist' - just new to handguns but not firearms. But I do quickly pick up on things and have been well mentored by others. So please don't take my advice as gospel.

When I insert the slide stop shaft through the frame bosses and the barrel lug, the outside part of the stop is parallel to the frame/slide axis, rather than turned down toward the trigger. The shaft pushes in without a struggle; you'll feel it click into place when it's fully seated.

Notice that the end of the shaft has a bevel and a groove cut into it. Now look at the frame (or at the parts diagram) and you'll see there is a wire spring on the right hand side where the frame has a thick boss. This spring is pushed up a tiny bit by the shaft bevel, then it snaps into the shaft's little keeper groove.

It sounds like you are not inserting your stop properly, you are forcing the non-bevelled end of the shaft against the keeper spring. Try it with the slide stop parallel to the frame/slide axis.

You may want to put a straightedge against the slide stop shaft
to see if it is bent. If that is the case, you've found another reason for this tight fitting problem.

Good luck.
« Last Edit: December 07, 2009, 06:18:38 PM by mountaincoulee »

Offline tekarra

  • Hero Member
  • *****
  • Posts: 3904
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #5 on: December 07, 2009, 08:14:30 PM »
coulee,

You are the first person I have heard that lubricates the slide stop pin.  When I got my first 75 many years ago, I looked at the configuration of the slide stop pin and the barrel lug and decided it could see some fast and strong action.    As a consequence I started to put a dab of grease in the barrel lug after esch cleaning and have not had a problem.  To me that is as important as lubricating the slide rails.  I clean after every shooting and always look for wear.

Offline 1SOW

  • Moderator
  • Hero Member
  • *****
  • Posts: 15006
  • GO GREEN - Recycle 9MM
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #6 on: December 07, 2009, 10:45:52 PM »
mountaincoulee is correct.   The slide stop is pressed in with the hammer at half cock, the slide moved slightly to the rear  and the slide and frame marks in line and the slide stop  thumb lever parallel to the slide.  It should press in easily.

also IMHO any metal surfaces that move need to be lubed where they come into contact with any other metal surfaces.

Type of lube is the shooters preferances, but lubricated to reduce friction/wear and heat.

Shooters who compete using the Shadow or modified 75s (as I do) like the guns because of the fast light actions.  These lighter springs work very well with low PF ammo often used in competition. The Custom shop often offers the Shadow-tuned to fire Win White Box reliably- I reload to a 130PF in my 124gr 9mm cartridges.

If I take some  SD ammo out to test and shoot it in my 75B, bad things might happen.  That lighter 11# recoil spring isn't going to absorb that high PF +P Gold Dot recoil down very much at all.  As a matter of fact it's going to hammer all the impact points in the gun.  Put the heavier springs in it and it will shoot them nicely.

P.S. I'm relatively new to CZ so I've probably only fired 10-12 thousand rounds through mine.  The last 4-5K have been my light reloads.  I did break a trigger spring once, but I do dry fire for practice.  Trigger spring breakage is a more likely problem than the slide stop by far.  
« Last Edit: December 07, 2009, 11:13:25 PM by 1SOW »

Offline E.Shell

  • Sr. Member
  • ****
  • Posts: 544
Re: Why does the Slide Stop go Bad on a CZ75 style guns?
« Reply #7 on: December 07, 2009, 10:48:53 PM »
I always lube the lug/slide stop engagement surfaces with bolt grease too.
The beatings will continue until morale improves.

 

anything