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  • Labeled FN 509 Trigger Spring Kit M*CARBO
  • FN 509 Trigger Spring Kit Contents
  • FN 509 Trigger Upgrade Kit M*CARBO
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FN 509 Trigger Spring Kit

review-star review-star review-star review-star review-star
(4.84) 187 reviews
Price: $19.95
in-stock-product Availability: IN STOCK

Retail: Retail: $24.95

You Save: $5.00 (20.0%)


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Product Information

About This Item

Description

FN 509 Trigger Spring Kit - What's Included:

  • Custom Lighter Sear Spring
  • Custom Lighter Disconnector Spring
  • Custom Lighter Striker Spring
  • Custom Lighter Striker Block Spring

Custom FN 509 Trigger Job to reduce trigger pull from a factory 7.25lbs to a modified 4.25lbs, giving you a 40% FN 509 Trigger Pull Reduction! Best FN 509 Trigger Upgrade for Increased Performance. Lighter and Smoother FN 509 Trigger Pull and Improved FN 509 Trigger Reset. Custom FN 509 Accessories by Combat Veterans! Best FN 509 Aftermarket Parts to get the Most Performance out of your FN 509 Pistol! 

The FN 509 Trigger Mod is a must have for FN 509 Aftermarket Trigger Upgrades! Improved Accuracy with Custom FN 509 Trigger Upgrade designed by Combat Veterans! Best way to improve the FN 509 Trigger with Custom FN 509 Trigger Spring Kit by M*CARBO! Corrects Problems with Factory FN 509 Trigger.

Custom FN 509 Trigger Upgrade to Improve Performance and Accuracy! If you have ideas for more FN 509 Accessories send us an email! help@mcarbo.com

Best FN 509 Upgrades for Competition Level Performance!

FN 509 Resources:

If you're getting the FN 509 Trigger Spring Kit, then you might find the following FN 509 Resources useful in further enhancing your firearm. Download the FN 509 Owners Manual to plan your next firearm project.

FN 509 Owner's Manual
FN 509 Exploded View
FN 509 Trigger Spring Kit Printable Instructions

M*CARBO No Hassle 100% Lifetime Guarantee:

The FN 509 Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee.

Drop Tested and Approved:

FN 509 Trigger Spring Kit is drop Tested according to SAAMI Standard Z299.5 rating (12" & 48").

Tested and Approved:

The FN 509 Trigger Spring Kit has been tested repeatedly to ensure reliable operation and safety.

Veteran Owned and Operated Business:

American made FN 509 Trigger Spring Kit is designed and manufactured by Combat Veterans. We will donate a portion of your purchase to the Military Foundations we humbly support.

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 FN 509 Trigger Spring Kit. 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.

Reviews
easy day
review-star review-star review-star review-star review-star
Installed this along with the upgraded striker, was an easy day though I thought it might mimic the P365XL upgrade, much easier and feels and works flawless. Thanks MCARBO for great install videos
Fn 509 spring kit
review-star review-star review-star review-star review-star
I am pleasantly surprised with the difference your fn 509 spring kit has made. I have a compact version and absolutely love the ergonomics of this pistol, but the trigger weight is way too heavy. Your kit has made this pistol fantastic. Thank you
review-star review-star review-star review-star review-star
It's a 20$ spring kit not a fix all. It helps lighten the trigger pull for sure. I have only fired 100 rounds with this spring kit. Has a week return also kind of catchy. Worried about the longevity of these springs they seem kind of cheep. So far it's not bad but I would not say it's great ether.
New Love
review-star review-star review-star review-star review-star
I've fallen in love all over again with my 509T. I've never fallen out of love with it, the springs just brought my love to new heights. It drastically changed the trigger pull making it lighter, while totally eliminating the grit most 509Ts were experiencing. My trigger manipulations are way better both with primary and support hand. It's definitely a must have, especially for the price. I fully enjoyed the install process, along with polishing. I just placed my order for the striker...can't wait.
Easy upgrade
review-star review-star review-star review-star review-star
Within a 1/2 hour you upgrade your trigger pull . Great video for install. Well worth the money.
Good choice
review-star review-star review-star review-star review-star
The kit works fine and reduced my trigger pull to just over 4 lbs. it’s a bit tricky to install, but if you follow the instructional video you will do fine.
Trigger pull improved
review-star review-star review-star review-star review-star
Installed the FN509 trigger spring kit, before the install trigger pull was over 8 lb, after the install trigger pull is 5 lb.
FN 509
review-star review-star review-star review-star review-star
So much better than the factory trigger. I’m ordering one now for my FN 509C. Thank you.
Questions & Answers
0 0
Question:
In previous installations you’ve sanded and polished the striker block (example M&P Shield), will doing so with the 509 striker block be helpful and can be done or very bad idea?
DAnder72 February 24, 2023 8:19 AM
Answers
It can recomended all depends if it is need it and how much polishing you will do.
Answered by
M*CARBO-Tech / February 28, 2023 9:39 AM
0 0
Question:
I see it works with 509C, doesn't "specifically state" 509M - just want to make sure before I order along with the striker.
James E Koller January 15, 2023 9:05 PM
Answers
Yes, these parts will work in the 509M!
Answered by
Timothy Parrish / January 24, 2023 2:35 PM
0 0
Question:
Will this fit the 509 Edge Long Slide?
GerryM January 6, 2023 6:03 AM
Answers
It also functions in 509C, 509C Tactical, and FNS Models, but I don't think we have tested it on that exact model; if the internal is the same and only the barrel and slide are longer, it can work.
Answered by
Waldo@MCARBO / January 30, 2023 10:27 AM
0 0
Question:
Is this trigger spring kit compatible with the apex tactical trigger kit?
Terrence Martindale December 31, 2022 2:39 PM
Answers
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:01 AM
0 0
Question:
is this the same striker spring that comes with the striker kit?
November 29, 2022 8:54 AM
Answers
Yes it is! We include it at no extra cost with the striker to ensure safe and proper function of the lighter-weight Titanium Striker. If you choose to purchase both the spring kit and striker, then you will end up with a free spare striker spring.
Answered by
Abby Marino / December 30, 2022 1:35 PM
0 0
Question:
Does the FN 509 Trigger Spring Kit work on the FN 509 Compact?
June 21, 2022 12:57 PM
Answers
functions in 509C, 509C Tactical, and FNS Models
Answered by
Waldo@MCARBO / June 21, 2022 1:04 PM
0 0
Question:
Is your spring kit compatible with the Apex trigger system? If so, what would be the expected difference combined?
BigTex37 April 21, 2022 8:22 PM
Answers
We do not guarantee our spring kit with any other aftermarket parts, including the Apex Trigger System. We are, however, working on new upgrades for this model ourselves, which gives us better control to confirm compatibility! Please send an email to help@mcarbo.com if you would like to be notified directly for any new MCARBO upgrades for the FN 509!
Answered by
Abby Marino / April 27, 2022 12:12 PM
0 0
Question:
Any options for the new 502 Rimfire version or any chance some of the 509 kit would help the 502 SAO 5 lb trigger?
rjferber March 16, 2022 1:56 PM
Answers
We haven't tested any of these springs in the 502, but if you send us an email to help@mcarbo.com we will save your contact information along with your product request to our idea log!
Answered by
Abby Marino / April 14, 2022 8:07 AM
0 0
Question:
It says it will fit FNS also so would it fit a FNS 40? If it does I would rather order order the same time for my 509T
Yellolab94 January 20, 2022 1:37 PM
Answers
I am sorry for our delayed response in the Q&A section. Yes this spring kit will work for your FNS 40!!
Answered by
Abby Marino / April 13, 2022 8:50 AM
0 0
Question:
I am going to install the trigger spring kit in my FN 509 LS Edge. Besides the striker and striker block, what else would you suggest I polish? Really looking forward to the installation. The factory trigger is really "gritty". It was disappointing for a fairly expensive pistol. Thanks for the help. Bob Turner
RWT January 10, 2022 3:17 PM
Answers
Each gun is a little different, I would look for any parts that show witness marks (wear) such as the trigger bar, if it shows signs of rubbing on the frame or another part, you can polish up that area to improve the feel. Use caution, to much polishing can be a bad thing. So take your time and do little by little.
Answered by
Kenneth Noble / June 9, 2022 9:08 AM
0 0
Question:
Does this trigger spring kit function with my FN Five-Seven? If not, do you offer one for it?
December 2, 2021 5:47 PM
Answers
We have not tested it for the 5 7 model so i would not advise trying it. Currently we do not offer one for the 5 7
Answered by
Kenneth Noble / June 9, 2022 9:10 AM
0 0
Question:
Any reason this would not work with an Apex Tactical FN509 trigger? Thanks!
November 19, 2021 4:17 AM
0 0
Question:
I have been using this and have been pleased w/ the performance. I recently upgraded to the Apex Tactical performance trigger which includes a new sear. It feels that the strike seems weaker. Should I put back all of the OEM springs back or perhaps just the sear spring?
October 18, 2021 2:11 PM
Answers
Thank you for contacting us, I believe the issue is with the APEX striker combined with our striker spring. If you would like to maintain the APEX striker I would swap back to the Factory striker spring, or you can swap back to the factory striker and maintain our spring. The difference in weight between the two strikers combined with the lighter striker spring can lead to light strikes, especially with reloaded or steel cased/surplus ammo.
Answered by
/ December 16, 2021 11:58 AM
0 0
Question:
If I bought this kit for the 509/c/t and only installed, let’s say just the striker firing pin spring and striker block spring to start? Would I see any potential benefits? Less grit? Less drag?
Loadedmike October 2, 2021 7:33 PM
Answers
Hey Brother, You will definitely see a reduction although we cannot give you a definitive amount. In regards to the smoothness and drag. So long as you polish some of the parts, you'll be good to go!
Answered by
Matt@mcarbo.com74555 / October 5, 2021 11:09 AM
0 0
Question:
Will this function in the FN 509 LS Edge?
DaddyFixIt September 25, 2021 12:45 AM
Answers
Hello, our FN 509 kit is compatible with all FN 509 models, including the LS Edge.
Answered by
Crystal@MCARBO.com / September 29, 2021 9:30 AM

About This Item

FN 509 Trigger Spring Kit - What's Included:

  • Custom Lighter Sear Spring
  • Custom Lighter Disconnector Spring
  • Custom Lighter Striker Spring
  • Custom Lighter Striker Block Spring

Custom FN 509 Trigger Job to reduce trigger pull from a factory 7.25lbs to a modified 4.25lbs, giving you a 40% FN 509 Trigger Pull Reduction! Best FN 509 Trigger Upgrade for Increased Performance. Lighter and Smoother FN 509 Trigger Pull and Improved FN 509 Trigger Reset. Custom FN 509 Accessories by Combat Veterans! Best FN 509 Aftermarket Parts to get the Most Performance out of your FN 509 Pistol! 

The FN 509 Trigger Mod is a must have for FN 509 Aftermarket Trigger Upgrades! Improved Accuracy with Custom FN 509 Trigger Upgrade designed by Combat Veterans! Best way to improve the FN 509 Trigger with Custom FN 509 Trigger Spring Kit by M*CARBO! Corrects Problems with Factory FN 509 Trigger.

Custom FN 509 Trigger Upgrade to Improve Performance and Accuracy! If you have ideas for more FN 509 Accessories send us an email! help@mcarbo.com

Best FN 509 Upgrades for Competition Level Performance!

FN 509 Resources:

If you're getting the FN 509 Trigger Spring Kit, then you might find the following FN 509 Resources useful in further enhancing your firearm. Download the FN 509 Owners Manual to plan your next firearm project.

FN 509 Owner's Manual
FN 509 Exploded View
FN 509 Trigger Spring Kit Printable Instructions

M*CARBO No Hassle 100% Lifetime Guarantee:

The FN 509 Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee.

Drop Tested and Approved:

FN 509 Trigger Spring Kit is drop Tested according to SAAMI Standard Z299.5 rating (12" & 48").

Tested and Approved:

The FN 509 Trigger Spring Kit has been tested repeatedly to ensure reliable operation and safety.

Veteran Owned and Operated Business:

American made FN 509 Trigger Spring Kit is designed and manufactured by Combat Veterans. We will donate a portion of your purchase to the Military Foundations we humbly support.

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 FN 509 Trigger Spring Kit. 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.

Product Reviews (187)
review-star review-star review-star review-star review-star
4.84
easy day
review-star review-star review-star review-star review-star
Installed this along with the upgraded striker, was an easy day though I thought it might mimic the P365XL upgrade, much easier and feels and works flawless. Thanks MCARBO for great install videos
Fn 509 spring kit
review-star review-star review-star review-star review-star
I am pleasantly surprised with the difference your fn 509 spring kit has made. I have a compact version and absolutely love the ergonomics of this pistol, but the trigger weight is way too heavy. Your kit has made this pistol fantastic. Thank you
review-star review-star review-star review-star review-star
It's a 20$ spring kit not a fix all. It helps lighten the trigger pull for sure. I have only fired 100 rounds with this spring kit. Has a week return also kind of catchy. Worried about the longevity of these springs they seem kind of cheep. So far it's not bad but I would not say it's great ether.
New Love
review-star review-star review-star review-star review-star
I've fallen in love all over again with my 509T. I've never fallen out of love with it, the springs just brought my love to new heights. It drastically changed the trigger pull making it lighter, while totally eliminating the grit most 509Ts were experiencing. My trigger manipulations are way better both with primary and support hand. It's definitely a must have, especially for the price. I fully enjoyed the install process, along with polishing. I just placed my order for the striker...can't wait.
Easy upgrade
review-star review-star review-star review-star review-star
Within a 1/2 hour you upgrade your trigger pull . Great video for install. Well worth the money.
Good choice
review-star review-star review-star review-star review-star
The kit works fine and reduced my trigger pull to just over 4 lbs. it’s a bit tricky to install, but if you follow the instructional video you will do fine.
Trigger pull improved
review-star review-star review-star review-star review-star
Installed the FN509 trigger spring kit, before the install trigger pull was over 8 lb, after the install trigger pull is 5 lb.
FN 509
review-star review-star review-star review-star review-star
So much better than the factory trigger. I’m ordering one now for my FN 509C. Thank you.

Questions & Answers

15 Questions

0 0
Question:
In previous installations you’ve sanded and polished the striker block (example M&P Shield), will doing so with the 509 striker block be helpful and can be done or very bad idea?
DAnder72 February 24, 2023 8:19 AM
Answers
0 0
It can recomended all depends if it is need it and how much polishing you will do.
Answered by
M*CARBO-Tech / February 28, 2023 9:39 AM
0 0
Question:
I see it works with 509C, doesn't "specifically state" 509M - just want to make sure before I order along with the striker.
James E Koller January 15, 2023 9:05 PM
Answers
0 0
Yes, these parts will work in the 509M!
Answered by
Timothy Parrish / January 24, 2023 2:35 PM
0 0
Question:
Will this fit the 509 Edge Long Slide?
GerryM January 6, 2023 6:03 AM
Answers
0 0
It also functions in 509C, 509C Tactical, and FNS Models, but I don't think we have tested it on that exact model; if the internal is the same and only the barrel and slide are longer, it can work.
Answered by
Waldo@MCARBO / January 30, 2023 10:27 AM
0 0
Question:
Is this trigger spring kit compatible with the apex tactical trigger kit?
Terrence Martindale December 31, 2022 2:39 PM
Answers
0 0
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
0 0
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
0 0
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:21 AM
0 0
We only test with OEM parts; We can't say if it will work with APex
Answered by
Waldo@MCARBO / January 30, 2023 10:01 AM
0 0
Question:
is this the same striker spring that comes with the striker kit?
November 29, 2022 8:54 AM
Answers
0 0
Yes it is! We include it at no extra cost with the striker to ensure safe and proper function of the lighter-weight Titanium Striker. If you choose to purchase both the spring kit and striker, then you will end up with a free spare striker spring.
Answered by
Abby Marino / December 30, 2022 1:35 PM
0 0
Question:
Does the FN 509 Trigger Spring Kit work on the FN 509 Compact?
June 21, 2022 12:57 PM
Answers
0 0
functions in 509C, 509C Tactical, and FNS Models
Answered by
Waldo@MCARBO / June 21, 2022 1:04 PM
0 0
Question:
Is your spring kit compatible with the Apex trigger system? If so, what would be the expected difference combined?
BigTex37 April 21, 2022 8:22 PM
Answers
0 0
We do not guarantee our spring kit with any other aftermarket parts, including the Apex Trigger System. We are, however, working on new upgrades for this model ourselves, which gives us better control to confirm compatibility! Please send an email to help@mcarbo.com if you would like to be notified directly for any new MCARBO upgrades for the FN 509!
Answered by
Abby Marino / April 27, 2022 12:12 PM
0 0
Question:
Any options for the new 502 Rimfire version or any chance some of the 509 kit would help the 502 SAO 5 lb trigger?
rjferber March 16, 2022 1:56 PM
Answers
0 0
We haven't tested any of these springs in the 502, but if you send us an email to help@mcarbo.com we will save your contact information along with your product request to our idea log!
Answered by
Abby Marino / April 14, 2022 8:07 AM
0 0
Question:
It says it will fit FNS also so would it fit a FNS 40? If it does I would rather order order the same time for my 509T
Yellolab94 January 20, 2022 1:37 PM
Answers
0 0
I am sorry for our delayed response in the Q&A section. Yes this spring kit will work for your FNS 40!!
Answered by
Abby Marino / April 13, 2022 8:50 AM
0 0
Question:
I am going to install the trigger spring kit in my FN 509 LS Edge. Besides the striker and striker block, what else would you suggest I polish? Really looking forward to the installation. The factory trigger is really "gritty". It was disappointing for a fairly expensive pistol. Thanks for the help. Bob Turner
RWT January 10, 2022 3:17 PM
Answers
0 0
Each gun is a little different, I would look for any parts that show witness marks (wear) such as the trigger bar, if it shows signs of rubbing on the frame or another part, you can polish up that area to improve the feel. Use caution, to much polishing can be a bad thing. So take your time and do little by little.
Answered by
Kenneth Noble / June 9, 2022 9:08 AM
0 0
Question:
Does this trigger spring kit function with my FN Five-Seven? If not, do you offer one for it?
December 2, 2021 5:47 PM
Answers
0 0
We have not tested it for the 5 7 model so i would not advise trying it. Currently we do not offer one for the 5 7
Answered by
Kenneth Noble / June 9, 2022 9:10 AM
0 0
Question:
Any reason this would not work with an Apex Tactical FN509 trigger? Thanks!
November 19, 2021 4:17 AM
0 0
Question:
I have been using this and have been pleased w/ the performance. I recently upgraded to the Apex Tactical performance trigger which includes a new sear. It feels that the strike seems weaker. Should I put back all of the OEM springs back or perhaps just the sear spring?
October 18, 2021 2:11 PM
Answers
0 0
Thank you for contacting us, I believe the issue is with the APEX striker combined with our striker spring. If you would like to maintain the APEX striker I would swap back to the Factory striker spring, or you can swap back to the factory striker and maintain our spring. The difference in weight between the two strikers combined with the lighter striker spring can lead to light strikes, especially with reloaded or steel cased/surplus ammo.
Answered by
/ December 16, 2021 11:58 AM
0 0
Question:
If I bought this kit for the 509/c/t and only installed, let’s say just the striker firing pin spring and striker block spring to start? Would I see any potential benefits? Less grit? Less drag?
Loadedmike October 2, 2021 7:33 PM
Answers
0 0
Hey Brother, You will definitely see a reduction although we cannot give you a definitive amount. In regards to the smoothness and drag. So long as you polish some of the parts, you'll be good to go!
Answered by
Matt@mcarbo.com74555 / October 5, 2021 11:09 AM
0 0
Question:
Will this function in the FN 509 LS Edge?
DaddyFixIt September 25, 2021 12:45 AM
Answers
0 0
Hello, our FN 509 kit is compatible with all FN 509 models, including the LS Edge.
Answered by
Crystal@MCARBO.com / September 29, 2021 9:30 AM

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