Author Topic: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?  (Read 1376 times)

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Offline falconman515

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I purchased the kit with all Cajun Gun Works recoil springs for my SP-01 and was curious what the recommended spring weight is for standard ball 124 / 115 grain (blazer brass, AE, Etc.) 9mm most are using with the best results???
I got the SS guide rod from CGW as well.

And I currently have no other upgrades to the pistol as of yet, just stock right now minus the CGW X10 Barrel Bushing.

Thanks so much and I look forward to the replies! ;)
« Last Edit: January 05, 2018, 07:18:56 AM by falconman515 »
CZ 75 SP-01

Online Joe L

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #1 on: January 05, 2018, 07:56:36 AM »
If you are shooting factory box ammo and it is cycling OK as is, no need to change it.  I think I went down two pounds from factory in both the 75B and P-09 for use with the lighter match ammo loads from Atlanta Arms.  I am not a run and gun type shooter.  Some folks go softer on the springs than I will.  I tend to use the heaviest spring that will allow the gun to cycle reliably, just to make sure it locks up exactly the same for each shot.  Run and gunners are wanting to tune the gun to their grip and second shot timing, so tend to run lighter springs than I will for slow precision shooting.  If the ejected case will land between 4 and 6 feet away, I'm happy.  Light springs may result in ejection distances of 8-12 feet?  But the slide is easier to cycle by hand with a light spring also.  The light springs are harder on parts stopping the slide's motion to the rear also. 

So "best" is dependent on the gun usage and ammo choice.  The factory spring works great (from what I remember) with most box ammo after the new gun loosens up a little, which takes 100-300 rounds.  After that, the factory spring will usually work well even with softer box ammo or go at most 2 lb softer if the slide doesn't catch the next round when cycling with the factory spring. 

Joe
CZ-75B 9mm and Kadet, 97B"E", two P-09's, P-07, P-10C

Offline CZATC

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #2 on: January 07, 2018, 11:44:14 AM »
This is the CGW tech page. The selection process should be the same regardless of action parts. Much like assessing ejection patterns of AR 15 to decide on buffer weights.

https://cajungunworks.com/technical-support/

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CZ 75 SP01-bone stock....CGW bushing and 85 trigger in parts box waiting
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Offline CzDave

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #3 on: January 09, 2018, 12:31:58 PM »
I use a 10lb. in my 75 and a 9lb in my TSO.
This is for 150gn coated for a power factor of about 135. This is for practical shooting.
I think most guns are way oversprung. Just my opinion.

I know many guys using 9-10 lb for .40 loaded to major power factor.

Offline Vinny

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #4 on: January 09, 2018, 01:45:53 PM »
I use a 10lb. in my 75 and a 9lb in my TSO.
This is for 150gn coated for a power factor of about 135. This is for practical shooting.
I think most guns are way oversprung. Just my opinion.

I know many guys using 9-10 lb for .40 loaded to major power factor.

Wow! I guess I'm at the other end of the spectrum; but I defer to the advise from CGW or Joe L.  I've been using the STOCK CZUSA flat-wound spring for my SP-01 Tac and it measures 16.5-17 lbs. However, I tend to shoot hotter standard pressure loads. It seems to like Win NATO 124 best with these springs, right back on target. But I've also run 14 or 15 lb. springs with regular 124 gr.   Accordingly - YMMV
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Offline MissionaryMike

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #5 on: January 09, 2018, 04:42:37 PM »
Choosing the correct recoil spring depends more on how hot the load is, and not so much the actual weight of the bullet.  115/124 grain factory Blazer Brass ammo shoots almost as light as my competition reloads, so you can use a relatively light recoil spring.  I have an 11# in mine.  As for other factory ball ammo, you'll have to experiment as per the advice already issued above.
"We think the 'X' is a sweet pistol, but like most CZ's, there is going to be some fine tuning to Americanize it."  -Schmeky a.k.a. CGW a.k.a. David

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Offline CzDave

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #6 on: January 18, 2018, 03:51:25 PM »
I use a 10lb. in my 75 and a 9lb in my TSO.
This is for 150gn coated for a power factor of about 135. This is for practical shooting.
I think most guns are way oversprung. Just my opinion.

I know many guys using 9-10 lb for .40 loaded to major power factor.

Wow! I guess I'm at the other end of the spectrum; but I defer to the advise from CGW or Joe L.  I've been using the STOCK CZUSA flat-wound spring for my SP-01 Tac and it measures 16.5-17 lbs. However, I tend to shoot hotter standard pressure loads. It seems to like Win NATO 124 best with these springs, right back on target. But I've also run 14 or 15 lb. springs with regular 124 gr.   Accordingly - YMMV

Almost every competitive shooter I know (quite a few) shoots way lighter springs than that. But none of them are shooting 100 yards off a bench, either, like JoeL does.
I defer to my own testing and what I have personally seen only, or to that of high lever shooters I personally know. Not an expert, and just my opinion.

Offline Vinny

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #7 on: January 18, 2018, 05:47:12 PM »
I use a 10lb. in my 75 and a 9lb in my TSO.
This is for 150gn coated for a power factor of about 135. This is for practical shooting.
I think most guns are way oversprung. Just my opinion.

I know many guys using 9-10 lb for .40 loaded to major power factor.

Wow! I guess I'm at the other end of the spectrum; but I defer to the advise from CGW or Joe L.  I've been using the STOCK CZUSA flat-wound spring for my SP-01 Tac and it measures 16.5-17 lbs. However, I tend to shoot hotter standard pressure loads. It seems to like Win NATO 124 best with these springs, right back on target. But I've also run 14 or 15 lb. springs with regular 124 gr.   Accordingly - YMMV

Almost every competitive shooter I know (quite a few) shoots way lighter springs than that. But none of them are shooting 100 yards off a bench, either, like JoeL does.
I defer to my own testing and what I have personally seen only, or to that of high lever shooters I personally know. Not an expert, and just my opinion.

So yes, it does depend upon what you're trying to accomplish. Low PF competition loads would need light recoil springs; Higher PF military or defense loads would need heavier springs like the 16-17 lb springs that come stock on the SP-01 Tactical.  The OP mentioned wanting to shoot "standard ball 124/115 ammo like Blazer, AE, etc." which I believe would be somewhere in between.
« Last Edit: January 20, 2018, 09:47:07 AM by Vinny, Reason: typo correction »
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Offline scroadkill

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #8 on: January 18, 2018, 09:04:43 PM »
for 147gr factory my sp01 seems very happy with a 10# for no dip. for a regular diet of 124/115 I'de suggest  trying a 11# recoil spring for quick follow ups.. 14# if just plinking.

Offline CzDave

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #9 on: January 19, 2018, 10:38:20 AM »
I use a 10lb. in my 75 and a 9lb in my TSO.
This is for 150gn coated for a power factor of about 135. This is for practical shooting.
I think most guns are way oversprung. Just my opinion.

I know many guys using 9-10 lb for .40 loaded to major power factor.

Wow! I guess I'm at the other end of the spectrum; but I defer to the advise from CGW or Joe L.  I've been using the STOCK CZUSA flat-wound spring for my SP-01 Tac and it measures 16.5-17 lbs. However, I tend to shoot hotter standard pressure loads. It seems to like Win NATO 124 best with these springs, right back on target. But I've also run 14 or 15 lb. springs with regular 124 gr.   Accordingly - YMMV

Almost every competitive shooter I know (quite a few) shoots way lighter springs than that. But none of them are shooting 100 yards off a bench, either, like JoeL does.
I defer to my own testing and what I have personally seen only, or to that of high lever shooters I personally know. Not an expert, and just my opinion.

So yes, it does depend upon what you're trying to accomplish. Low PF competition loads would need light recoil springs; Higher PF military or defense loads would need heavier springs like the 16-17 lb springs that come stock on the SP-01 Tactical.  The OP mentioned wanting to shoot "standard ball 125/115 ammo like Blazer, AE, etc." which I believe would be somewhere in between.

Yes, we all realize it depends on what you are trying to accomplish. That has been covered.

As I mentioned, many use 9-10 lb springs on .40 MAJOR power factor competition guns.
Have a friend that has over 40G through a 2011 .40 with 9lb springs, for example.

CZC seems to use 11lb. recoils springs on their 9mm competition guns.

I believe my 9mm MINOR rounds are at least as hot as anything he mentioned shooting. Not trying to argue, just telling you what my opinion is.

Offline Vinny

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #10 on: January 19, 2018, 11:30:43 AM »
"As I mentioned, many use 9-10 lb springs on .40 MAJOR power factor competition guns.
Have a friend that has over 40G through a 2011 .40 with 9lb springs, for example."

CZDave,
I defer to your knowledge of competition guns.
Just curious if you or friend are still running the original stock slide stop w/o replacement??
Wonder why CZ builds the SP-01 Tac with 16-17lb springs??

Just trying to learn something here. Thanks for your input, Vinny
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Offline CzDave

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Re: What CGW Recoil Spring weight do you recommend for 124/115 grain 9mm?
« Reply #11 on: January 22, 2018, 03:08:53 PM »
"As I mentioned, many use 9-10 lb springs on .40 MAJOR power factor competition guns.
Have a friend that has over 40G through a 2011 .40 with 9lb springs, for example."

CZDave,
I defer to your knowledge of competition guns.
Just curious if you or friend are still running the original stock slide stop w/o replacement??
Wonder why CZ builds the SP-01 Tac with 16-17lb springs??

Just trying to learn something here. Thanks for your input, Vinny

I broke two slide stops: both in a stock gun with heavy stock springs. I switched to lighter springs and a shadow slide stop and have gone twice as many rounds and it has not broken again. That's on a CZ75.

On my TSO, I do not use a slide stop.

EDIT: Forgot to answer your other question. My buddy's 2011 does not use a slide stop either. Just a pin.
« Last Edit: January 22, 2018, 03:10:41 PM by CzDave »