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FN 509® MRD-LE


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FN 509® MRD-LE


This firearm only available to LE/Military/First Responders.  Must provide credentials when purchasing.  

Austin’s note:  If I had to go back to the streets tomorrow, and if I were compelled to carry a striker fired pistol with RDO, it would be this gun.  

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 who can’t settle for less than 100% reliability. With unmatched longevity in the most demanding trials, 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 exceeds 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.


  • CALIBER: 9mm
  • OPERATION: Double-action
  • MAG CAPACITY: 17 Rd.
  • WEIGHT: 27 oz.
  • TWIST RATE: 1:10″ RH
  • HEIGHT: 5.56″
  • WIDTH: 1.35″
  • TRIGGER PULL: 4.5 lb. -6.0 lb.
  • SIGHT RADIUS: 5.79″


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




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




Three interchangeable backstraps

Three 17-round magazines

Four MRD mounting plates

Owner’s manual

Locking device

FN Ballistic case

FN 509® MRD-LE