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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

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(4.82) 182 reviews
Price: $19.95
in-stock-product Availability: IN STOCK

Retail: $24.95

You Save: $5.00(20.0%)


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Product Information

About This Item

  • Reduce your trigger pull from 7.25lbs to a modified 4.25lbs  (Average results can vary up to +/- 1lb)
  • Improve accuracy and overall FN 509 Performance
  • Solid 40% Trigger Pull Reduction!
  • Custom FN 509 Aftermarket Trigger Upgrade!
  • Also functions in 509C, 509C Tactical, and FNS Models!
  • Will NOT function in FNX Models.
  • Highest Quality American Spring Steel ASTM A228 Music Wire
  • FN 509 Trigger Kit includes a Custom Lighter Sear Spring, Disconnector Spring, Striker Spring and Striker Block Spring
  • Protected by the M*CARBO 100% Lifetime Guarantee
  • Made in the USA!
  • Fast Same Day Shipping!
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.

No Hassle 100% Lifetime Guarantee Ribbon


Drop Tested and Approved:

FN 509 Trigger Spring Kit is built with M*CARBO ASTM Spec Springs that will offer a perfect trigger pull reduction with an unlimited drop test rating (3", 6", 9" & 12"+).

Drop Tested and Approved Icon


Tested and Approved:

The FN 509 Trigger Spring Kit has been tested repeatedly with numerous brands of ammunition to ensure reliable operation and safety.

Product Tested and Approved Sticker


Veteran Owned and Operated Business:

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

Veteran Owned Business Ribbon


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
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.
So So Results in 509 LS Edge
review-star review-star review-star review-star review-star
I didn’t see any great improvements in my FN 509 LS Edge’s trigger pull weight or smoothness as a result of installing this kit. In fact I did it in 2 phases with the springs in the slide being changed first, which might have slightly improved my trigger. But I waited about 2 months before installing the MCarbo lighter sear and disconnector springs and I know they made no difference to my trigger pull. It’s all good though because my 509 LS Edge actually had a pretty good trigger to start with so I was just seeing if I would get a bit better trigger with the MCarbo kit -and that’s about what I got.
509 spring kit
review-star review-star review-star review-star review-star
Installed the spring kit in my FN509 midsize. Cleaned up the take up, crisp break, and smoothed out the reset. I don't have a trigger pull gauge, but I would say it cut the weight almost in half. The absolute best $20 I've ever spent on a firearm.
Still 7 pounds
review-star review-star review-star review-star review-star
Had a 7 pound trigger before installing and have a 7 pound trigger after installation maybe a little smoother its hard to tell with out having them side by side
Much lighter and smoother. East instal
review-star review-star review-star review-star review-star
Have wanted a 509 for a long time and finally got one. Trigger was garbage! 6.5#. Bought this kit and dropped it to around 5-5.5. While installing I noticed there was some casting marks on the safety plunger and the striker so cleaned those up and the trigger is much better.

Now my only complaint is the overtravel of the factory trigger so have an apex kit coming and hoping this kit and the apex will marry well and finish off this amazing pistol
Saved the FN-FNS
review-star review-star review-star review-star review-star
Was considering trading in my FNS. But after no polishing and just the kit I reduced the trigger pull from 7lbs to 4.75…I will keep this gun not only in my collection but into my rotation for CCW.
Questions & Answers
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

About This Item

  • Reduce your trigger pull from 7.25lbs to a modified 4.25lbs  (Average results can vary up to +/- 1lb)
  • Improve accuracy and overall FN 509 Performance
  • Solid 40% Trigger Pull Reduction!
  • Custom FN 509 Aftermarket Trigger Upgrade!
  • Also functions in 509C, 509C Tactical, and FNS Models!
  • Will NOT function in FNX Models.
  • Highest Quality American Spring Steel ASTM A228 Music Wire
  • FN 509 Trigger Kit includes a Custom Lighter Sear Spring, Disconnector Spring, Striker Spring and Striker Block Spring
  • Protected by the M*CARBO 100% Lifetime Guarantee
  • Made in the USA!
  • Fast Same Day Shipping!

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.

No Hassle 100% Lifetime Guarantee Ribbon


Drop Tested and Approved:

FN 509 Trigger Spring Kit is built with M*CARBO ASTM Spec Springs that will offer a perfect trigger pull reduction with an unlimited drop test rating (3", 6", 9" & 12"+).

Drop Tested and Approved Icon


Tested and Approved:

The FN 509 Trigger Spring Kit has been tested repeatedly with numerous brands of ammunition to ensure reliable operation and safety.

Product Tested and Approved Sticker


Veteran Owned and Operated Business:

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

Veteran Owned Business Ribbon


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 (182)
review-star review-star review-star review-star review-star
4.82
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.
So So Results in 509 LS Edge
review-star review-star review-star review-star review-star
I didn’t see any great improvements in my FN 509 LS Edge’s trigger pull weight or smoothness as a result of installing this kit. In fact I did it in 2 phases with the springs in the slide being changed first, which might have slightly improved my trigger. But I waited about 2 months before installing the MCarbo lighter sear and disconnector springs and I know they made no difference to my trigger pull. It’s all good though because my 509 LS Edge actually had a pretty good trigger to start with so I was just seeing if I would get a bit better trigger with the MCarbo kit -and that’s about what I got.
509 spring kit
review-star review-star review-star review-star review-star
Installed the spring kit in my FN509 midsize. Cleaned up the take up, crisp break, and smoothed out the reset. I don't have a trigger pull gauge, but I would say it cut the weight almost in half. The absolute best $20 I've ever spent on a firearm.
Still 7 pounds
review-star review-star review-star review-star review-star
Had a 7 pound trigger before installing and have a 7 pound trigger after installation maybe a little smoother its hard to tell with out having them side by side
Much lighter and smoother. East instal
review-star review-star review-star review-star review-star
Have wanted a 509 for a long time and finally got one. Trigger was garbage! 6.5#. Bought this kit and dropped it to around 5-5.5. While installing I noticed there was some casting marks on the safety plunger and the striker so cleaned those up and the trigger is much better.

Now my only complaint is the overtravel of the factory trigger so have an apex kit coming and hoping this kit and the apex will marry well and finish off this amazing pistol
Saved the FN-FNS
review-star review-star review-star review-star review-star
Was considering trading in my FNS. But after no polishing and just the kit I reduced the trigger pull from 7lbs to 4.75…I will keep this gun not only in my collection but into my rotation for CCW.

Questions & Answers

5 Questions

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

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