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The FN 509®  MRD-LE delivers more precision and versatility than any other duty-rated handgun. Building on the proven FN 509 lineup, the exclusive upgrades for law enforcement place every advantage in officers’ hands, with unmatched accuracy from a striker-fired handgun. Making up the new high-performance package is a conical striker, flat-faced duty-rated trigger, and the FN Low-Profile Optics-Mounting System™ , for fast sight acquisition and consistent shot placement.

3-dot tritium sights co-witness with the MRD, for maximum sighting versatility and a clean sight picture, day or night. The industry’s most comprehensive and adaptable optics mounting platform, allows armorers to quickly mount common duty-rated optics.

The 509 MRD-LE is the choice for agencies that can’t settle for less than 100% reliability. With unmatched longevity in the most demanding trails, the FN 509 platform has been tested beyond 1-million rounds, chosen by departments for its compatibility with a wide variety of training and duty ammunition. With a polished feed ramp and chamber, consistent feeding and extraction exceed every standard.

The smooth, drop-safe trigger compliments the perfect sight picture. FN’s precision trigger and high-performance striker, adapted from the FN 509 LS Edge™, has a positive wall before a clean break, improving accuracy for all officers. With a target-crowned, hammer-forged barrel, a lifetime of tight groups is in reach.


Patented FN Low-Profile Optics Mounting System fits most MRDs
Precision accuracy with unmatched sighting versatility
Duty-rated trigger breaks cleanly at 90°
Superior ergonomics for maximum speed and control


Quickly mount MRDs with the FN Low Profile Optics Mounting System™
3-dot tritium night sights co-witness to MRD, rear sight dovetail driftable
Front and rear cocking serrations for clean slide manipulations
External extractor, loaded chamber visual indicator


Drop-safe, duty-rated fire control group
Best-in-class flat-face trigger breaks cleanly at 90°
New, high-performance conical striker reduces trigger pull weight by ≈1-lbs.
4.5-lbs. to 6.0-lbs. trigger pull


4″ Target-crowned, hammer forged barrel for precision accuracy
Polished chamber and ramp for reliable feeding and extraction across ammunition types

Frame & Magazine:

Three interchangeable backstraps fit all hand sizes, improves sight recovery
Multi-surfaced texture for the perfect grip and faster follow up shots
Mil-Std 1913 rail fits all common weapon lights
Ambidextrous slide stop
Right-hand only magazine release
Black 17-rd magazines, high-vis low-friction follower

FN 509 MRD LE3 BLK 9mm



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