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Old 01-09-2015, 14:40   #1
17glock17
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22lb vs. 24lb (ISMI) Recoil Spring: Gen 4 Glock 20

Noobish question, I know. Forgive me.

Pretty straightforward question though: Which would be better weight recoil spring for the pistol? It will be fed a diet of Underwood 200g XTPs and TMJs.

I was pretty sold on the 22lb recoil spring until I read the reports of it being under-sprung by about 2lbs.
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Old 01-09-2015, 15:14   #2
WeeWilly
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I can't speak for a Gen4, as all my G20's are Gen 3 G20SF.

I use a 22lb ISMI spring for my hot loads. It keeps the slide off the frame under my heaviest loads, but has less felt recoil than the 24lb.

I am not exactly sure why, but with my 22lb versus 24lb, the felt recoil is significantly different, I suspect the springs are not exactly linear in their weight/effect.

Also, using a 22lb ISMI spring on a stainless guide rod, I can shoot my lightest 40S&W loads and they cycle 100%, 24lb spring will yield some FTF in lighter loads.
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Old 01-28-2015, 11:39   #3
17glock17
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Solid info Willy! Are both your 22 and 24 lb springs ISMI?
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Old 01-28-2015, 12:01   #4
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I can't feel any difference between 22 and 24# ISMI on a steel guide rod in my G4 20, so I use the 24#. It cycles .40 power loads all the way up to 180gr 1300fps loads.

I doubt the flat wire springs have much, if any rising rate. This type of spring is typically pretty linear. But, Glocks are flexy, so the frame can damp a lot of energy as well.
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Old 01-28-2015, 12:01   #5
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Originally Posted by 17glock17 View Post
Solid info Willy! Are both your 22 and 24 lb springs ISMI?
Yes, both ISMI flat springs.
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Old 01-28-2015, 21:18   #6
ctious
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Ismi springs don't live up to stated weighs. Sucks. Wolf springs are way stronger per stated weight.
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Old 01-29-2015, 10:41   #7
Clusterfrack
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I like ISMI springs, and just buy the weight that works for my load.
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Old 01-29-2015, 14:00   #8
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Originally Posted by WeeWilly View Post
I can't speak for a Gen4, as all my G20's are Gen 3 G20SF.

I use a 22lb ISMI spring for my hot loads. It keeps the slide off the frame under my heaviest loads, but has less felt recoil than the 24lb.

I am not exactly sure why, but with my 22lb versus 24lb, the felt recoil is significantly different, I suspect the springs are not exactly linear in their weight/effect.

Also, using a 22lb ISMI spring on a stainless guide rod, I can shoot my lightest 40S&W loads and they cycle 100%, 24lb spring will yield some FTF in lighter loads.
How far does your brass fly with the 22lb spring with a 200gr
boolit at 1275fps.
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Old 01-31-2015, 12:58   #9
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I can't feel any difference between 22 and 24# ISMI on a steel guide rod in my G4 20, so I use the 24#. It cycles .40 power loads all the way up to 180gr 1300fps loads.

I doubt the flat wire springs have much, if any rising rate. This type of spring is typically pretty linear. But, Glocks are flexy, so the frame can damp a lot of energy as well.
That's interesting that you can't tell a difference. I think I will have to order a 24lb spring also.
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Old 01-31-2015, 13:32   #10
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How far does your brass fly with the 22lb spring with a 200gr
boolit at 1275fps.
Another zip code?

Seriously, pretty far. Like maybe 20-25'?
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Old 01-31-2015, 13:56   #11
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Another zip code?

Seriously, pretty far. Like maybe 20-25'?
Lol...
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Old 01-31-2015, 14:20   #12
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How does your G20 G4 shoot now? If there are no problems, why are you wanting to switch out springs? Are you replacing your dual spring system for the single spring?



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Old 01-31-2015, 15:33   #13
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How does your G20 G4 shoot now?
I've yet to shoot it

Quote:
Originally Posted by redbaron007 View Post
If there are no problems, why are you wanting to switch out springs? Are you replacing your dual spring system for the single spring?



red
I am replacing the OEM RSA to avoid frame battering (I plan to shoot nothing but Underwood out of the pistol).

It will be a single ISMI spring on a Glockmeister SS Guiderod.
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Old 01-31-2015, 15:53   #14
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Quote:
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I've yet to shoot it



I am replacing the OEM RSA to avoid frame battering (I plan to shoot nothing but Underwood out of the pistol).

It will be a single ISMI spring on a Glockmeister SS Guiderod.
I've shot several hundred rounds of Underwood...180, 155, 165 gr ammo and show no frame battering or feeding issues.

I, too, thought about replacing my RSA, but I was highly encouraged to shoot with the stock RSA to see what happens. So far, I have no issues.

Just FYI....



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Old 02-01-2015, 19:35   #15
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Originally Posted by redbaron007 View Post
I've shot several hundred rounds of Underwood...180, 155, 165 gr ammo and show no frame battering or feeding issues.

I, too, thought about replacing my RSA, but I was highly encouraged to shoot with the stock RSA to see what happens. So far, I have no issues.

Just FYI....



red
This sure seems like sound advice. If I bought a Gen 4 G20, I would give it a try stock first as well. My G29sf has the same style RSA as the Gen 4 guns, it keeps the slide off the frame just fine.
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Old 02-01-2015, 23:38   #16
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This sure seems like sound advice. If I bought a Gen 4 G20, I would give it a try stock first as well. My G29sf has the same style RSA as the Gen 4 guns, it keeps the slide off the frame just fine.
I prob would too if it wasn't a full FDE model...I am being a little more OCD than I normally would be.
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Old 02-02-2015, 00:43   #17
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I prob would too if it wasn't a full FDE model...I am being a little more OCD than I normally would be.
I certainly understand the concern. In the case of my Gen 3 G20sf's it took quite a few very hot rounds before I could start to see the impression of the lower front part of the slide on the frame, just in front of the forward slide channel lug. Any serious mushrooming (really visible damage) would takes many, many hundreds of rounds, perhaps thousands, I think.

In either case, I think you will get it dialed pretty quickly.

Good luck.
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Old 02-02-2015, 11:23   #18
jkib
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I have a gen4 20 that I purchased used that came with an aftermarket 22 or 24lb spring. Don't remember what the original owner specified. I installed it when I loaded up some of the Underwood 220gr hardcast and DT 200gr hardcast. The loads really pounded the slide with pretty harsh recoil. I re-installed the gen4 OEM spring and it performed much better...less pounding and felt recoil. Brass still flew about 25' though with those loads. I'm sticking with the stock spring, but would like to see it offered in a 22lb version for the hot stuff.
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Old 02-02-2015, 11:33   #19
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I have a gen4 20 that I purchased used that came with an aftermarket 22 or 24lb spring. Don't remember what the original owner specified. I installed it when I loaded up some of the Underwood 220gr hardcast and DT 200gr hardcast. The loads really pounded the slide with pretty harsh recoil. I re-installed the gen4 OEM spring and it performed much better...less pounding and felt recoil. Brass still flew about 25' though with those loads. I'm sticking with the stock spring, but would like to see it offered in a 22lb version for the hot stuff.
Thanks for the report. How many rounds did you fire and how does the frame look?
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Old 02-02-2015, 11:33   #20
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I certainly understand the concern. In the case of my Gen 3 G20sf's it took quite a few very hot rounds before I could start to see the impression of the lower front part of the slide on the frame, just in front of the forward slide channel lug. Any serious mushrooming (really visible damage) would takes many, many hundreds of rounds, perhaps thousands, I think.

In either case, I think you will get it dialed pretty quickly.

Good luck.
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