Recoil Spring weights. Frustrating.

[Davehb]

Wife has a 75B omega 9mm.
Looking for a spare recoil spring for it and I’m about to pull my hair out.
Wolff (16# they say), CGW (says stock 9mm is 16#), And Cz custom (lists stock 9mm as 17#) , and a others list 17-16# recoil spring as stock.

Well my wife cannot rack a baretta, Glock etc which I believe are 17# recoil.
Prior to the Omega only one we found she could rack easily enough to use was the sw ez so I really don’t see the Omega having a recoil spring weight over 15lb otherwise I don’t think she could rack it.

I called CZ (Should have asked if they changed recoil weights recently when I called but forgot) after looking he checked then double checked and said the 9mm omega comes factory with a 13# recoil spring.

Trying to figure where the 17# was coming from I had him check the 40 he said it does come with a 17# recoil spring.

Now I’m wondering if its a recent change to mitigate slide stop breakage.

Still confused cause CZUsa is only one says 75B 9mm has such a light spring but figure I’ll order the Weight they state it cames with.
Any experience on this?


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[Davehb]

And for what it’s worth the man I spoke to at Cz parts USA said the mainspring weight on both is 16.6# give or take a 1 

every where I had read previously stated it was a 20# main spring.


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[Rmach]

I always thought a factory CZ75b recoil spring is 15lbs, but a recent search is telling me 14lbs.

[Davehb]

I always thought a factory CZ75b recoil spring is 15lbs.

That’s why I’m confused and frustrated.
Functions good and why want to stay OEM.
To quote CGW “The OEM recoil spring weight in a full-size 9mm CZ pistol is 17#’s, including the CZ-97 in .45 ACP.  The compact  9mm metal framed CZ’s use a 16# recoil spring.”

Knowing my wife had been unable to rack any other brands with recoil spring16# or higher had me wondering if they changed the weight, if it was just design, or if the 17# weight is one of those misprints by one party that got perpetuates on the  internet, and why I finally called CZ.

It is easy to pull back. Not as easily as s&w’s ez but still lots easier than say an m9.
Then looking for OEM replacement which most are out of most kept tagging the 16-17# as OEM recoil spring. But a couple did list 14# as OEM.
CZ USA representative said.
75b Omega 9mm
Main spring 16.6# +/-1
Recoil spring 13#

40 cal
Mainspring 16.6# +/- 1
Recoil spring 17#

[emoji2373]


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[2morechains]

The factory spring weights are a moot point for me because I always change them out. 

You should be able to drop in a 13 or 15 lb main spring into that gun and expect it to light off any factory round.  It will also have the added benefit of reducing the DA pull weight. 

As far as recoil spring I use a 10 lb spring but that is due to the ammo that I shoot (132-ish PF).  Buy her some different weight recoil springs from CGW and see how the gun recoils with springs as low as 10 lbs and go up to 15.  Let the recoil help inform which spring to go with.  Unless you have her shooting +P I suspect she can get away with a lower weight spring.  Plus it’ll make it easier to rack the slide. 

[M1A4ME]

CZ USA shows 75/85 recoil springs at 16 lbs. for the factory spring (SKU 0420053001)

They also list several more with lower and higher spring weights.

They even offer another 16 lbs. recoil spring using a different SKU (19614).

Seems CZ USA says the factory unit is 16 lbs.

right off the CZ USA web store page:

RECOIL SPRING 75/85 9MM
Be the first to review this product
FACTORY RECOIL SPRING 75/85 9MM 16LBS
OUT OF STOCK SKU 0420053001
$5.00

Oh, they list a different recoil spring for the CZ75/85 in .40 S&W  SKU 042005301602, but don't show a spring weight for it.

[SoCal]

The factory spring weights are a moot point for me because I always change them out. 

You should be able to drop in a 13 or 15 lb main spring into that gun and expect it to light off any factory round.  It will also have the added benefit of reducing the DA pull weight. 

As far as recoil spring I use a 10 lb spring but that is due to the ammo that I shoot (132-ish PF).  Buy her some different weight recoil springs from CGW and see how the gun recoils with springs as low as 10 lbs and go up to 15.  Let the recoil help inform which spring to go with.  Unless you have her shooting +P I suspect she can get away with a lower weight spring.  Plus it’ll make it easier to rack the slide. 

This^^

You should tune the gun to HER requirements not some generic "one size fits none".  Factory guns are a LOT of compromises.

[Davehb]

CZ USA shows 75/85 recoil springs at 16 lbs. for the factory spring (SKU 0420053001)

They also list several more with lower and higher spring weights.

They even offer another 16 lbs. recoil spring using a different SKU (19614).

Seems CZ USA says the factory unit is 16 lbs.

right off the CZ USA web store page:

RECOIL SPRING 75/85 9MM
Be the first to review this product
FACTORY RECOIL SPRING 75/85 9MM 16LBS
OUT OF STOCK SKU 0420053001
$5.00

Oh, they list a different recoil spring for the CZ75/85 in .40 S&W  SKU 042005301602, but don't show a spring weight for it.

Being out of stock is why I called CZ.
That’s when they looked it up and said, “no, the omega 9mm has a 13#. Even more confused I asked what the 40 had, 17#.

Researching on wolff I got.
Factory Rating: 14 Lb. - 9mm, .45 ACP, Super .38 and 10mm
    Factory Rating: 12 Lb. - .40 S&W all models except CZ
    Factory Rating: 16 Lb. - .40 S&W - CZ Only
    Factory Rating: 13 Lb. - CZ 97 .45 ACP

I guess since so many different are listed I’ll just do what some suggested and get a tuning pack and see what functions well with the loads.


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[Davehb]

The factory spring weights are a moot point for me because I always change them out. 

You should be able to drop in a 13 or 15 lb main spring into that gun and expect it to light off any factory round.  It will also have the added benefit of reducing the DA pull weight. 

As far as recoil spring I use a 10 lb spring but that is due to the ammo that I shoot (132-ish PF).  Buy her some different weight recoil springs from CGW and see how the gun recoils with springs as low as 10 lbs and go up to 15.  Let the recoil help inform which spring to go with.  Unless you have her shooting +P I suspect she can get away with a lower weight spring.  Plus it’ll make it easier to rack the slide. 

This^^

You should tune the gun to HER requirements not some generic "one size fits none".  Factory guns are a LOT of compromises.

I figure that’s what I’ll do.
PF of what she using is 148-150 for hottest load. 


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[M1A4ME]

More to it than it seems, I'll bet.

Hammer spring weight?  Stronger the hammer spring the more rearward force is required to push the hammer rearward.

Effects of the bottom rear corner shape/radius as the slide moves rearward to cock the hammer.  I remember reading 1911 guys sometimes radius that firing pin retaining plate rear bottom corner to make it easier to pull the slide to the rear.

Ammo used.

Maybe others not obvious until you really dig into the function/mechanics of recoil operation.

I never thought about the Omega pistol being able to use lighter recoil springs.  Is it because the Omegas cocking the hammer function is easier than the older CZ75 action?  Or is it because the CZ75 is an older design with everything set up around the ammo used 30 or 40 years ago vs. the ammo used now and CZ just never taking the time to revise the specs for the older pistols?  I don't know.

[Davehb]

Not sure what the spring weight on ours is anymore. [emoji17]
I ordered a 14 and 13# recoil spring for spares because CZ told me it has a 13#, Wolff lists it as 14#, CGW, and CZcustom saying they come 16# factory, another listed it at 17#.

Considering my wife could rack it new I went with the lower weight of 13#. Got new springs in and my wife can’t rack it with the new 13#.

Considering this is a new gun with less than 40rounds through it makes it confusing on what’s actually in it and why the wide variance in weights listed by so many.
New it racked as easy as m&p9 ez while still ejecting cartridge casings 6-8’

Yes I “set” the spring.


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[Davehb]

More to it than it seems, I'll bet.

Hammer spring weight?  Stronger the hammer spring the more rearward force is required to push the hammer rearward.

Effects of the bottom rear corner shape/radius as the slide moves rearward to cock the hammer.  I remember reading 1911 guys sometimes radius that firing pin retaining plate rear bottom corner to make it easier to pull the slide to the rear.

Ammo used.

Maybe others not obvious until you really dig into the function/mechanics of recoil operation.

I never thought about the Omega pistol being able to use lighter recoil springs.  Is it because the Omegas cocking the hammer function is easier than the older CZ75 action?  Or is it because the CZ75 is an older design with everything set up around the ammo used 30 or 40 years ago vs. the ammo used now and CZ just never taking the time to revise the specs for the older pistols?  I don't know.

I don’t know.
Seems to be lot of disagreement out there.
Guess I’m just gonna have to buy a bunch and see.
CGW did tell me lots of people use the 12# in 75B.
I think that would actually feel closer to what it feels like now based off the 14 and 13# I’ve tried in it.


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[Davehb]

Update on recoil springs in case others need it.
After hours of emailing, and calling different spring manufacturers and gun shops. I called CZ again.
According to them, and serial number the 9mm 75B omega or 75B does come with a recoil spring of 13#.
They said it does not show to come with a 16 or 17# recoil spring.
They do also have available an OEM 11# (which I ordered) for the omega 9mm which I’m thinking is in the gun because wife can’t rack it with the new one I ordered that is supposed to be a 13# spring.

I don’t know where the 16# weight is coming from unless it got confused with 40cal in web articles.


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[Bret]

Whatever they're supposed to come with, it doesn't always work out that way.  I typically replace the factory recoil springs in my CZ's with the heaviest Wolff spring that it will run reliably.  When I bought my CZ 75 SA, it would just barely eject most cases.  Therefore, there was no need to increase the recoil spring weight.  I don't know if that was a QC issue or intentional.  As you have seem to have figured out, you'll just have to try a variety to see what works for you.

[Skookum]

My understanding is compact variants have heavier recoil springs than their full size counterparts, because a lighter, shorter slide firing the same round needs more resistance to avoid the slide battering the frame.


Regardless, to break in a recoil spring, store a pistol with the slide locked back for about a month.  Just as storing a new mag loaded for about a month will allow you to load it without a mag loader, locking the slide back for about a month will allow you, and your wife, to rack the slide easily, even without the hammer cocked.


Your wife can learn to rack even a slide with a recoil spring that's not broken in.  Search the internet for tips on how women do this.  When I get my CZs in 2012 I had a left (offside) frozen shoulder that was excrutiatingly painful.  I could not rack my pistols while holding them in my right hand.  I found a websight by a woman (what is that?) shooter, who gave clear instructions with which even the wimpiest gal could rack a slide.  It worked for me, so I believe her.  It involves holding the left arm steady while grasping the slide with an overhand grip, then thrusting the frame forward with the right hand and a counterclockwise rotation of the hip.  It imparted no pain to my left shoulder.  I think a common problem is that racking a slide is an almost violent manuever, but many try to do it gently.  I think the thought of it being a gentle action is in part fostered by competition shooters who post videos of their pistols tricked out with light recoil springs that are well broken in.