• 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 FNS-9 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

  • 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!  Correct FN 509 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.

Best FN 509 Upgrades for Competition Level Performance!

FN 509 Owners Manual & Exploded View:

If your 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.

    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 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"+).

    Tested and Approved:

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


    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.


    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.

    Overall Customer Rating of 76 Reviews:

    FN509 TRIGGER SPRING KIT

    Rating:
    Pros:
    Cons:
    MY FN 509 HAD AN AVERAGE TRIGGER PULL WEIGHT OF 6LBS 2OZ AND WAS "SCRATCHY". AN M*CARBO TRIGGER SPRING KIT GREATLY IMPROVED THINGS, RESULTING IN A 3LB 13.2OZ TRIGGER PULL, A CRISP BREAK AND SMOOTHER PULL. INSTALLATION WAS NOT DIFFICULT. I WATCHED M*CARBO'S HOW-TO VIDEO (AVAILABLE ON THEIR WEB SITE) TWICE TO FAMILARIZE MYSELF WITH THE PROCESS, THEN WITH THE VIDEO RUNNING AS A GUIDE, I INSTALLED THE KIT. IT DOES REQUIRE PATIENCE AS SOME OF THE PARTS ARE SMALL. FOR ME, IT WAS DEFINITLY WORTH THE EFFORT. FROM AN OLD VIETNAM VET, THANKS M*CARBO FOR YOUR SUPPORT AND YOUR SERVICE.

    FN 509 Trigger Kit and light primer strikes

    Rating:
    Pros:
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    Love the kit . Installed easily except for some fidgeting with the sear spring with a noticeable reduction in trigger pull.
    One small problem for me in this time of ammo shortages.
    I've got some Wolf steel cased 9mm that I've been using and my last time out after installing the kit I had two light primer strikes in the first 5 rounds. I immediately switched to some old Federal ammo I brought along (just in case) and had no other issues.
    Point is in this time of shoot what you can find be aware that some type ammo with harder primers may not function with the reduced weight striker spring and I would be cautious if using the lighter spring in a self defense gun unless you seriously test it with your carry ammo.
    I do like the results but will only use it as a range gun with the lightened spring.

    Great set up

    Rating:
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    I wasn’t super impressed with my FN509 trigger out the box even after 1k rounds. Found this spring set and gave it a try with an apex trigger. You can tell these aren’t just some springs in a pack, they really did there homework to get this set up to work right. All I can say is wow! This made a world of difference in the gun and would recommend anyone with this pistol to give it a try the video also makes it fool proof if you’re nervous. Thanks fellas,for setting me up with a great gun!!

    Great!!!

    Rating:
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    Great kit!! Easy no Bull shit install! Glad to buy products from a 10 group buddy

    Altanta, GA

    UNBELIEVABLE DIFFERENCE

    Rating:
    Pros:
    Cons:
    Of all the guns I own, not a single one gave me buyer's remorse like the FN 509T. I bought it for its looks what it offered as a package (I mean, FN threw the kitchen sink on this firearm). But that trigger pull was so heavy right out of the box, it affected my accuracy when at the range. I've put 750 rounds through it hoping that it would get lighter over time but it didn't. The only thing that's gotten better was that annoying gritty feeling, which thankfully started to fade a little, as the transition from wall-to-break became more defined.
    I didn't want to go the Apex route just to fix this because #1: I am no gunsmith, #2: I heard about people cracking their frames trying to punch one of the pins out #3: throwing more money at this gun was a no-no for me.
    So I figured there's got to be an alternative. Enters M CARBO Spring Kit.
    $20 folks!!! TWENTY!!! That was all it took to fall in love again with my 509. If you ever shot a CZ P10, you know how amazing their triggers are. Now, shave between 0.3 to 0.5 oz off that CZ P10C trigger (which out of the box is measured at 4.5 lbs) and that's what you'll be getting with this spring kit. The Youtube tutorial was very helpful. I had my fair share of struggle with the sear spring, but a little patience and being ok with walking away from it all to reset did the trick lol. The trouble was worth it!
    Shipping was very fast considering the times we're living in. I ordered it on a Saturday and got it at my doorstep by Tuesday, and you'll be updated on the status of your order as you'd expect from any serious business.

    Great buying experience, great customer service, and exceeded expectations as far as the product is concerned!

    Bravo!

    Number of questions: 0