• Reduce your trigger pull from 7.25lbs to a modified 4.25lbs
  • Improve accuracy and overall FN 509 Performance
  • Solid 40% Trigger Pull Reduction!
  • Custom FN 509 Aftermarket Trigger Upgrade!
  • 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.

    No Hassle 100% Lifetime Guarantee on Parts & Accessories:

    The FN 509 Trigger Spring Kit is protected by the M*CARBO No Hassle 100% Lifetime Guarantee. This means that at any time you can send it back and we will exchange it, issue a refund or assist you in any way possible. We even pay return shipping and automate the return process here!


    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.

    No Hassle M*CARBO 100% Lifetime Guarantee - This means that at any time you can send it back and we will exchange it, issue a refund or assist you in any way possible. No Hassles Ever!

    We even pay return shipping and automate the return process here!

    We pride ourselves in making quality parts for guys like us that appreciate great performance out of a well made firearm. So if you don't get the results you we're expecting or just don't like it. We will make it right by any means necessary. Send us an email to help@mcarbo.com We also pride ourselves in outstanding customer service so send us an email and we will show you.

    Once you're part of the M*CARBO Brotherhood your not just a customer...you're a Brother!M*CARBO Brotherhood - Veterans, Police Officers and 2nd Amendment Patriots! A portion of all sales go to the Military Foundations we humbly support.

    ATTENTION: We advise that all parts purchased from our inventory be installed and inspected by a qualified gunsmith. Modifying your weapon my be prohibited in your state. 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 my be incurred.

    Overall Customer Rating of 7 Reviews:
    Idaho

    Very happy with the results!

    Rating:
    Pros:
    Cons:
    I just installed 2 of these kits, 1 in a 509 tactical, and 1 in an FNS (the kit worked in the FNS without any issues). Install was fairly easy following the instructional video. Just be sure to watch the small parts and you should be fine. My 509 had a stock trigger pull of 7.5#, dropped to 6.5# with the frame springs installed, and finished at 5# with the slide springs. My FNS started at 7#, dropped to 6# with frame springs, and finished at 4.5# with the slide springs. Overall, based on my experience, it seams safe to expect around a 1# reduction from stock weight with the frame springs, and another 1.5# with the slide springs. I'm unsure how it would affect these numbers if you installed the parts in the reverse order. Overall reduction from stock should be around 2.5#. A 30+% reduction ain't bad at all!

    The only downside to this kit is that it initially seams a bit pricey for what you get in the bag. The end results are well worth the money however! I would definitely buy this kit again if I had another striker fired FN.

    Reduced Trigger pull to 4lbs!

    Rating:
    Pros:
    Cons:
    Excellent spring kit for a very affordable price. One of the best bangs for your buck literally! It is a simple installation after watching the instructional video (Recommended). Lightened the trigger pull significantly from 7lbs to 4lbs average after install. Fired 100 rounds at the range to test with no issues. Apex flat trigger coming in today and will see how it works together! Thanks Mcarbo!

    NC

    Made the 509 what it should have been

    Rating:
    Pros:
    Cons:
    The best thing I could have done for the 509. I only have 250 rounds through the new kit. So far I have zero malfunctions and the gun is a pleasure to shoot. The FN trigger sticking has not been something I have had to deal with after the first 500 rounds through it. There's a little slop but nothing bad at all. I had the kit installed by a gunsmith because I have fat fingers and didn't want to attempt it so I can't speak on the install.

    San Antonio

    I liked my FN-509. Now I love it.

    Rating:
    Pros:
    Cons:
    Pretty easy to install watching the MCarBo YouTube video. Smoothed out my trigger press. Off to the range for live fire testing.

    Thanks MCarBo. Good stuff.

    Michigan

    used in FNS .40 longslide

    Rating:
    Pros:
    Cons:
    This kit and a Apex trigger and sear Really works nice! Pull is quite crisp and under 4lbs with some minor polishing as well.