Compatible with Glock pistols (Gen 1–5), including Slimline models: Glock G42 · Glock G43 · Glock G43X · Glock G48.
- Reduce your trigger pull from an average stock of ~5.25 lbs to approximately ~3.5 lbs. (Average results can vary up to +/- 1 lb)
- Achieve up to a 33% reduction in trigger pull weight.
- Enhance accuracy and overall pistol performance.
- Easily tune your pistol to an approximate 3.5 lb trigger with this drop-in kit.
- Made from high-quality American spring steel for long life and consistent performance.
- Experience a smoother, more refined trigger pull with straightforward installation.
- Our trigger spring offers nearly 30% more power than the factory spring, reducing felt pull and improving reset.
- Owners of Glock 42, 43, and 44: select the M*CARBO Gen 5 Trigger Spring Kit.
- The reduced-power firing pin safety spring minimizes friction from the firing pin safety for an improved trigger pull.
- Achieve smoother trigger action and top-tier performance.
- Our firing pin springs offer improved consistency and durability over standard springs.
- Experience consistent, match-grade accuracy with these drop-in parts.
- Do you want us to install the parts and do the polishing work for you?
- Protected by the M*CARBO 100% Lifetime Guarantee
- Made in the USA!
- Fast Same Day Shipping!
WHAT'S IN THE KIT:
- 1 — 4 lb Reduced Power Firing Pin Spring
- 1 — 5 lb Reduced Power Firing Pin Spring
- 1 — 6 lb Increased Power Firing Pin Spring (factory is ~5.5 lb)
- 1 — 6 lb Extra-Power Trigger Spring (extra power reduces felt trigger pull weight)
- 1 — Reduced Power Firing Pin Safety Spring
- 1 — 1,000 Grit Silicon Carbide Sandpaper Square
- 1 — Synthetic Grease with PTFE
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK.
GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
Trigger Spring Kit — Gen 1–4 & Gen 5 Options
Compatible con pistolas Glock (Gen 1–5), incluyendo Slimline models: Glock G42 · Glock G43 · Glock G43X · Glock G48.
Two Trigger Spring Kit options to choose from:
- Gen 1–4 Trigger Spring Kit
- Gen 5 Trigger Spring Kit (recommended for owners of Glock 42, 43, and 44)
Looking for the best way to upgrade your trigger? The M*CARBO Trigger Spring Kit offers two calibrated options to reduce pull weight, smooth the action, and improve reset—far superior to a basic "25¢ trigger job."
- Reduce average trigger pull from ~5.25 lb to approximately ~3.5 lb. (Average results can vary up to +/- 1 lb)
- Achieve up to a 33% reduction in trigger pull weight.
- Enhance accuracy and overall pistol performance.
- Easily tune your pistol to an approximate 3.5 lb trigger with this drop-in kit.
- Springs made from high-quality American spring steel for durability and consistent performance.
- Smoother, more refined trigger pull with a straightforward installation.
- Trigger spring designed to offer nearly 30% more power than stock for improved reset and control.
- Owners of Glock 42, 43, and 44: select the Gen 5 Trigger Spring Kit option.
- Reduced-power firing pin safety spring minimizes friction to improve trigger feel.
- Improved firing pin springs deliver better consistency and durability over standard springs.
- Swap springs individually to fine-tune primer strike, trigger weight, and reset, or install the full kit for maximum performance.
- Want us to install the parts and do the polishing work for you?
- Protected by the M*CARBO 100% Lifetime Guarantee
- Made in the USA!
- Fast Same Day Shipping!
WHAT'S IN THE KIT:
- 1 — 4 lb Reduced Power Firing Pin Spring
- 1 — 5 lb Reduced Power Firing Pin Spring
- 1 — 6 lb Increased Power Firing Pin Spring (factory ~5.5 lb)
- 1 — 6 lb Extra-Power Trigger Spring (extra power reduces felt trigger pull)
- 1 — Reduced Power Firing Pin Safety Spring
- 1 — 1,000 Grit Silicon Carbide Sandpaper Square
- 1 — Synthetic Grease with PTFE
For polishing internal components we recommend the Firearm Polishing Kit. Watch our step-by-step Trigger Spring Install video for installation guidance.
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK.
GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
Drop Tested and Approved:
Trigger Spring Kit for Glock Pistols – Performance Upgrade is drop Tested according to SAAMI Standard Z299.5 rating (12" & 48").
Tested and Approved:
The Trigger Spring Kit for Glock Pistols – Performance Upgrade has been tested repeatedly to ensure reliable operation and safety.
ATTENTION:
You must be 18 yrs of age to purchase. We advise that all parts purchased from our inventory be installed and inspected by a qualified gunsmith. Modifying your weapon may be prohibited in your state. Do not modify your sear or hammer engagement surfaces, with or without the Trigger Spring Kit for Glock Pistols – Performance Upgrade. Before installing please be sure to check all local state and federal laws. By installing this part you agree to take full responsibility for any and all legal, health and warranty consequences that may be incurred.
Excellent spring kit
Mcarbo offers 3 different springs to fine tune your trigger to your liking. When you add this spring kit with the trigger you have a whole different gun. In gun pictured I have the 6lb spring, very crisp short take up and short reset
BP CUSTOM FIREARMS LLC
Parrish FL
Worked so well I bought second kit
I installed this in my Gen 5 Glock 17 which already felt pretty good out of the box. After inspecting the internals I opted not to sand or polish anything and just installed the springs. The improvement was immediate and the trigger pull is much smoother now. I was so impressed I bought I second kit for my other gen 5 Glock
Glock springs
I used the 4lb spring and all other springs. Easy installation, nice instruction video.
The trigger smoothed up and had a predictable break and reset while firing the Glock. Works great.
I'm very satisfied with all my mcarbo purchases. This is not the first time or last when my triggers need upgrade I trust mcarbo ....
glock 17 gen 5 spring kit
spring kit works great easy install if you're looking for an inexpensive trigger reduction can't
go wrong with this spring kit
Disappointed
Ordered for gen 5 only received firing pin spring Sent several emails and called haven’t got response in 3 weeks don’t know what’s with this company.
Glock 43x
Overall the spring kit does the intended job, however I had to use the factory striker spring in order to retain the safety of the trigger dingus functionality. With the softer springs the trigger wouldn't return forward enough to reset the dingus. I emailed about the issue over a week ago and have yet to hear anything back, will update my review once I've heard back.
Easy install
Parts arrived quickly, install videos were helpful. Once the spring kit was installed the trigger was much lighter and smoother. Big bang for the buck upgrade. Go for the polishing kit as well while you're at it.
Are there any upgrades for Gen 6 in the works?
I have Glock 19 Gen 5. Will this kit work with Glock Performance Trigger?
I recently picked up a G17 Gen 5 that has an APEX “action enhancement kit” installed. Will this kit work with that trigger kit?
Yes — our Trigger Spring Kit will work with a Glock G17 Gen 5 that has an APEX Action Enhancement Kit installed.
I have a G Force RPX9 Exodus, which is essentially a 3rd gen G19 clone. I don't see the G19 listed here specifically... Will these work for this gun? Thanks
Does this work on the G21 .45 ACP Gen 4? T.I.A.
D Max October 10, 2025 5:58 AM
Yes - Our kit works - choose gen 1-4
Will the Gen 1-4 kit work on the Ruger RXM since it is a Gen 3 clone?
3 is between 1 and 4 so should be good to go.
Answered by
Tim W /
May 22, 2026 3:43 AM
3 is between 1 and 4 so should be good to go.
Answered by
Tim W /
May 22, 2026 3:42 AM
Will the Gen 1-4 kit work on the Ruger RXM since it is a Gen 3 clone?
Fits Glock 19x
Yes, select the Gen 5 Trigger Spring Kit
Answered by
FOXX /
May 2, 2025 10:26 AM
What gen is the Glock 19X?
Answered by
FOXX /
May 2, 2025 10:25 AM
Will this work with a 43x?
Yes, select the Gen 5 Trigger Spring Kit
Answered by
FOXX /
May 2, 2025 10:17 AM
Can you add this spring kit to the glock performance trigger?
Yes, our Glock Trigger Spring Kit is compatible with the Glock Performance Trigger
Answered by
FOXX /
May 2, 2025 10:28 AM
What kind of results should I expect from a Glock 26 that already has the OEM minus disconnector installed (no other mods)?
Installing our spring kit can reduce that to approximately 3.5 to 4.0 lbs, depending on which striker spring you choose (4, 5, or 6 lb)
Answered by
FOXX /
May 2, 2025 10:23 AM
Which pound firing pin spring should i use for my Glock 30 .45 Auto? Thank you guys for your time!
Our kit includes 4 lb, 5 lb, and 6 lb striker springs, giving you flexibility depending on your intended use:
4 lb Striker Spring – Ideal for competition or range use, offering the lightest trigger pull. Please note it may cause light primer strikes with hard-primer or lower-quality ammunition.
5 lb Striker Spring (Factory Weight) – Recommended for general use, balancing improved trigger feel with reliable ignition across a wide range of ammunition types.
6 lb Striker Spring – Best for carry or duty use, ensuring the strongest ignition for hard-primer or defensive ammo and maintaining full reliability.
Answered by
FOXX /
May 2, 2025 10:21 AM
Will it work in the g42 as well?
Yes, select the Gen 5 Trigger Spring Kit
Answered by
FOXX /
May 2, 2025 10:16 AM
Will this work with gen 5 Glock 17
Which kit works with a Glock 26? Thanks
I HAVE INSTALLED A NUMBER OF YOUR GEN 1-4 TRIGGER SPRING KITS BUT I NOW HAVE A GEN 5 MODEL 45 AND IT SEEMS AS THOUGH THERE ARE NOT AS MANY PINS TO REMOVE AND ONE OF THE SMALLER SPRINGS IN THIS KIT SEEMS DIFFERENT FROM THE GEN 1-4 KIT. YOUR VIDEOS ARE GREAT!!! WILL THERE BE ONE COMING TO SHOW THE DIFFERENCE BETWEEN GEN 1-4 AND THE GEN 5 KIT INSTALLATION? THANKS FOR WHAT YOU DO!!
I already purchased the gen. 5 spring kit, and just put a bid on a "Glock Performance Trigger Flat Faced 70272 for Gen 5 Glocks" kit. It seems to me like they are as the glock kit does not seem to include any kind of spring, but I just want to make sure. Thanks!
Which kit works with Glock 41
Will the gen5 kit work in the G48?
Yes! Just make sure to get the Gen 5 kit.
Yes.YOU WILL NEED TO SELECT THE GEN 5 KIT
I had heard that the Glock 19X was a generation 4 so I ordered that kit without looking at the lower compared to the G23 Gen 3 I have. Are the trigger springs and firing pin safety spring interchangeable between the two kits?
The Gen 5 kit has a different Trigger Spring that will not fit on earlier Gens. The firing pin safety and firing pin springs are the same between both kits.
Will the Gen5 work on the slimline G43X MOS?
December 26, 2022 12:06 PM
Yes! Just make sure to get the Gen 5 kit.
I just bought a Glock 23 Gen 5. Can I assume the Glock gen 5 kit will work ok on it?
I bought the kit for my Glock 19 gen 5, but there is no video or written instructions for the trigger spring (disassembly/reassembly/polishing of the lower). Can I expect to see something to remedy any time soon?
The slide mod was a piece of cake thanks to the gen 4 video.
KentB November 1, 2022 8:51 PM
We have a few videos to catch up on. We are working on them.
Will this spring kit work on a Glock 21 gen2
Yes, just make sure you get the Gen 1-4 kit.
WILL THIS WORK FOR A SHADOW SYSTEMS CR920?
we haven't tested this on this firearm to be able to say it will work
Will this spring kit work in a Gen 3 Glock 30SF 45ACP
RTR April 21, 2022 11:15 PM
Yes, it will! Be sure to select "No" for the drop-down to ensure you get the correct (Gen1-4) Trigger Return Spring that will be compatible in your Gen 3 model.
Will this work with a Palmetto State Armory Dagger?
This spring kit is not guaranteed for anything other than Glock pistols.
Will this kit work on a Glock 40 10mm
Yes it will! You will need to select "No" in the dropdown to ensure you get the Gen1-4 Variation for the correct Trigger Return Spring.
Will this kit work with G48 MOS?
February 14, 2022 11:06 PM
Yes it will! You will need the Gen5 variation for your G48 MOS.
Does this work with the Glock 43x?
Absolutely! Be sure to select "YES" for the Gen5 variation to make sure you get the correct Trigger Return Spring for your model.
This Gen 5 work for Glock 45 Model?
yes the Gen 5 Spring kit is what you should select for this model!
I have a Gen 4 Glock 35 MOS, which is the .40 S&W. There is no Gen 5 for this model. Will the non-Gen 5 Glock Trigger spring kit work in this gun?
December 1, 2021 10:22 AM
correct, the Gen1-4 Spring kit will be the compatible kit for your model!
Is this compatible with the Glock G44 (.22LR) ? I believe the G44's lower is basically a G19 gen5 lower.
Which kit would I use for a Glock26?
ShawnM November 3, 2021 2:54 PM
The kit depends on the Gen of your firearm.
Which kit do I order for a Glock26?
ShawnM November 2, 2021 6:03 PM
Does it work with larger frame Glocks?.. I have a Glock 21 Gen 3 .. Thanks!
Yes is compatible just make sure to order for the right Gen.
Is there a video for the exchange of a GEN 5 trigger reset spring?. it is different from the Gen 4
Is the gen 5 kit compatible with glock 23 gen 5? Thanks.
Yes is compatible the Gen 5 kit
Will the Glock Gen 5 Kit work for my Glock 48?
Will this fit my Glock 23 Gen 3?
Hey Brother, the Gen 5 kit will fit the 43x and the 48.
Is this compatible with a Glock G45 Gen 5 and a G48 MOS?
Hey Brother, This indeed is!
Is this kit compatible with the glock 19x?
Yes! This kit is compatible with all Glock models. Please make sure to select the correct generation of your firearm to ensure you get the correct kit.
Can this kit be used with a Gen 3 Glock 34?
Yes, This kit is compatible with all Glock models. Just make sure you select the Gen 1-4 kit in the drop down menu.
Is this kit compatible with Glock 21 in 45acp
Yes! Our kit is compatible with the Glock 21. You will need the Gen 1-4 kit.