Factory springs in CZ 75B?

[Irving]

EDIT: I managed to find the factory spring rates. We can change this discussion to be more along the lines of this question now. Does a slide staying back while the magazine still has rounds, indicate a worn recoil spring?

I called Smith & Wesson, and they're sending me out a new recoil spring (Those jerks don't even give me a chance to pay for anything, they just keep sending me free stuff!) [Beer]

Hey guys, I looked in my manual, and tried asking online, but am having trouble finding the factory spring rate for the recoil spring and the main spring in my CZ 75B (1994).

I've had a few problems with my slide locking back on a partially emptied mag, and was thinking that maybe the recoil spring needs replaced. I bought the gun used at the beginning of the year and have no idea of it's history.

Also, I've done some minor (and very amateur) polish work on the gun, and was thinking about putting in a lighter main spring. Since I don't know what the factory spring rate is, I don't know which I want to buy yet.

The slide staying back issue was happening before I messed with the gun though. It only seems to happen if I rapid fire it, or limp wrist the gun and shoot from the hip or something. The limp wristing from the hip is a way that I like to see if I can make a gun jam (Glocks will stove pipe while doing this). The CZ never jams, but the slide does stay back sometimes. Anyone have any other input besides the recoil spring being worn?


This also happened to me on my Smith & Wesson M&P .40 compact during a match on Friday. The Smith is getting up to around 4,000 rounds so I just made sure to clean the pistol extra well and ordered a new spring from S&W. Does this sound like the right path I'm going down here?

[eerw]

CZ75..

hammer spring is around 20#
recoil spring is around 14#

usually if the slide is locking back prematurely. its a weak slide stop spring ( right side of frame just inside the rail) or something with the magazine follower or top round.

[Irving]

Thanks for the tips. I'll look into it. I figured it was a magazine thing on the CZ, because it has some crappy 10 round one. I picked up some new Mec Gars for it, but haven't had the chance to run it yet.

When it happened to my Smith, which has had 3,500 flawless rounds, I was thinking it was something besides the magazines.

So I'm looking at my M&P (because I have it with me) and I can't understand how a weak slide stop spring would cause the slide to stick back. Does it have something to do with the recoil of the gun over powering the spring tension and having the slide stop pop up when it's not supposed to?

[eerw]

on a CZ..
the spring holds the slide stop pin in place..you can see where it is machined to a flat. this keeps the slidestop from rolling and pivoting up and down..until the force of the follower and magspring push it up to lock the slide. if the spring is week and doesn't hold it..it will pivot. not common, but it does happen

as far as an M&P..I don't have one anymore..so can't help you there..sorry.

[Irving]

Eerw, I haven't seen you post for a while now, but it seems like you were just on yesterday. Do you have any experience with using a recoil buffer in any of your CZ's? Do you find them necessary?

I'm just now getting around to ordering new springs for my gun, and I was thinking about ordering this for $13.99:


Performance Pak 9mm - Pak contains 1 each 12 Lb. reduced power recoil spring, 16 Lb. extra power recoil spring, extra power firing pin spring and 17 Lb. reduced power hammer spring. (Stock No. 14100)

I did a search and read some stuff tonight, and although it related to 1911's, it had me wondering what all the hammer spring affects in the gun. It sounds like when considering changing your hammer spring, you also need to take into consideration the weight/style of your hammer and the weight/style of your firing pin. My plan was to install the extra power 16lb recoil spring, extra power firing pin spring, and the reduced power 17lb hammer spring. Everything else on the gun is factory as far as I know. Should I be okay going from the factory 20lb hammer spring to the 17lb hammer spring with no consideration of the other parts? Is there a safe range or rule of thumb I should know about?

My post got kind of long winded so let me summarize:

1) Thoughts on recoil buffer on stock pistol with #2 in mind.
2) Thinking of doing 16lb recoil, extra power firing pin, and 17lb hammer spring. Is this okay keeping all other things the same?
3) I can't actually find any where that has slide stop springs in stock.
4) My understanding is that +5% Wolf magazine springs are +10% for CZ and +5% for all the clones. I feel like I can't really go wrong with +5% mag springs in all my mags. True?


Thanks for any help.

[eerw]

My post got kind of long winded so let me summarize:

1) Thoughts on recoil buffer on stock pistol with #2 in mind.
2) Thinking of doing 16lb recoil, extra power firing pin, and 17lb hammer spring. Is this okay keeping all other things the same?
3) I can't actually find any where that has slide stop springs in stock.
4) My understanding is that +5% Wolf magazine springs are +10% for CZ and +5% for all the clones. I feel like I can't really go wrong with +5% mag springs in all my mags. True?




1. they're OK, I have tried them and have really seen no reason to have them, no appreciable gain from using them from what I experienced.

2. depending your ammo. that should be OK. the FP spring from the factory is fine and really doesn't need to be changed out. the 17# hammer spring will light off anything out there. for most of my loads/ammo ( which is loaded for USPSA minor or factory bulk ammo) I use a 11#-12# recoil spring. for my carry ammo I use a 14# recoil spring. but that is my personal preference. some people think that is too light.

3. slidestop springs are pretty much a item from CZ-USA. they rarely need changing and can be adjusted to add or lessen tension on the slidestop.

4. mag springs..I usually go with +5 or factory and have had no issues with my mags or feeding.

Let me know if any other questions.

[Irving]

Thanks for the quick response!

I was hoping I could bend on the slide stop spring and give it a little more tension. Since I got the new magazines, I haven't had the slide stay back on a partially empty mag anymore. I have a feeling the crappy 10 round mag the gun came with just has a weak spring.

Thanks again.

[Irving]

eerw, do you have any tips on taking the bend out of the flat spring in the mag housing so the mags drop free? I admit that I haven't looked it up yet, so if there are a million tutorials out there, just let me know and I'll go find one.

By the way, you never mentioned what a pain in the butt it is to get the pin that holds the slide stop spring back into place.

[eerw]

eerw, do you have any tips on taking the bend out of the flat spring in the mag housing so the mags drop free? I admit that I haven't looked it up yet, so if there are a million tutorials out there, just let me know and I'll go find one.

By the way, you never mentioned what a pain in the butt it is to get the pin that holds the slide stop spring back into place.

sorry...about that..that is a huge PITA.

mag brake..pull the grips off, tap out the top pin, then tap out lower pin, (it holds the hammer spring plug and hammer spring) on a stock gun, usually the brake has a small strip of steel that hooks up under the hammer strut..I usually cut this off.
this should allow you to get the brake out. once out. bend the kink out of it and reinstall.
CZCustom has a stainless brake that won't bend that allows for drop free mag.

if you go to CZforumsite.info under the home gunsmithing forum, there is a bunch of how to's that people have done.

[Irving]

I've taken the gun all the way apart except for the trigger (and that slide stop spring until recently). So it is just a matter of bending the bend out of the way? Is there any point to cutting off that loop other than just making reassembly easier?

Also, it sounds like you've done it, but do you actually prefer to have your mags drop free?

And thanks again for your quick responses.

[eerw]

cutting the loop, just makes it easier..I hate fighting that little piece of steel, when it serves no great purpose.

I like my mags to drop free..as I do a bunch of USPSA type competitions, so the benefit is in getting the mag clear during reloads.