Glock 34 gen4 changing recoil spring to change impulse?

[45Fundi]

I typically prefer guns with a faster slide speed and I am shooting a Glock 34 Gen 4 and it feels like it is going "Ku-Chunk, Ku-Chunk, etc." when firing. If I go from the OEM 17# to a different brand or lighter weight mainspring will the Glock 34 Gen 4 function reliably? Anyone with first hand experience willing to advise me? Thanks!

 

[louu]

http://www.jagerproducts.com/index.php?main_page=index&cPath=35

I've only tried the 13 pound spring on the Jager guide rod. You should experiment with different weights. Personally only shot the 34 for half a season then got into 2011s. When I play around with my glock now it does feel a little slower than what I'm use to. 

[Malarky112]

I've got a steel guide rod with a lighter spring...(not sure the exact weight off the top of my head) and reliability was not effected at all...your good to play around.

[vluc]

Jager (captured) with a 13# on one 34.4, uncaptured steel guide rod with 13# on another 34.4, works fine.

 

Both ISMI springs

[Cuz]

I’ve got an uncaptured extended steel rod with an 11 lb spring running fine in my G34 with 125PF loads.
I also have an 11 lb captured spring in a G17 that runs fine with the same ammo but chronos at 121 PF.

Both are ISMI springs.


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[45Fundi]

Sorry for late reply. Thanks for the info!

[RVRSE]

I can second everyone's recommendation at using the jager guiderod with a 13 pound spring, I'm using one on my 34.5 and really like the impulse.

[DDave]

I use ISMI 13# in my glocks with zev stainless guide rods, i dont know how many thousands of rounds I have with that setup but they work 100% with every 9mm round ive tried

[Sinister4]

13 pound spring, 4.5 firing pin spring 125-130 pf  zero issues   a LOT of rounds lol

[Cuz]

I wonder how the Glock Performance Trigger will change the equation. When I installed the GPT in my 17, I went back to a stock striker spring, and then had to bump up the recoil spring to get the gun to lock up reliably. 

[buckyjames1]

I bought a complete sprting kit (22-20-18-15-13-11lbs)

I started at the 18lb(about the glock factory)

18lbs: no difference

15lb: slide a tad bit easier to manipulate, no noticeable difference while shooting

13lb: slide Definity easier to manipulate, Definity easy on the recoil/impulse side

11lb: VERY easy to manipulate slide, noticed even less impulse ...BUT....I could feel the slide not locking into place.     Occasionally when chamber checking, I would have to gently knock the slide to fully lock up. 11lb just did not feel right at all.

 

The kit didnt come with a 12lb spring. 

For me...13lb was the way to go

[Braxton1]

On 7/22/2023 at 12:13 AM, Cuz said:

I wonder how the Glock Performance Trigger will change the equation. When I installed the GPT in my 17, I went back to a stock striker spring, and then had to bump up the recoil spring to get the gun to lock up reliably. 

This is to be expected.  The GPT (and the Timney) hold the Firing Pin at a fully-cocked position, therefore exerting more spring pressure resisting slide closure.

[45Fundi]

Great info guys! Thanks!

[Cuz]

18 hours ago, Braxton1 said:

This is to be expected.  The GPT (and the Timney) hold the Firing Pin at a fully-cocked position, therefore exerting more spring pressure resisting slide closure.

 

19 hours ago, buckyjames1 said:

I bought a complete sprting kit (22-20-18-15-13-11lbs)

I started at the 18lb(about the glock factory)

18lbs: no difference

15lb: slide a tad bit easier to manipulate, no noticeable difference while shooting

13lb: slide Definity easier to manipulate, Definity easy on the recoil/impulse side

11lb: VERY easy to manipulate slide, noticed even less impulse ...BUT....I could feel the slide not locking into place.     Occasionally when chamber checking, I would have to gently knock the slide to fully lock up. 11lb just did not feel right at all.

 

The kit didnt come with a 12lb spring. 

For me...13lb was the way to go

 

Yup, first I bumped up my spring to 15 lbs I think, then had to bump up my ammo, which was a bit on the light side anyway.  It ran good this summer, I liked not having to worry about positive ignition and never had any light strikes.