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66-100390 FN 509 NMS Blk/Blk MRD w/ 3 17rd & Night Sight

Manufacturer: FN
SKU: FN66-100390
Manufacturer part number: 66-100390
UPC: 845737009151
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This evolution of the FN 509 MRD full-size, now featuring the FN Low Profile Optics Mounting System, gives you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. The FN 509 MRD features a four-inch barrel and slide with an optics mounting package, standard 17-round capacity, and is compatible with larger capacity FN 509 magazines with the use of a sleeve. The improved controls aid in manipulation, the new improved texturing on the two included backstraps provides better recoil management, and a new flatter-faced trigger allows for more controllable trigger press and cleaner break.

General Specs:

  • Striker-fired autoloader
  • Double-action operation
  • FN Low Profile Optics Mounting System
  • 3-dot night sight


  • Easily racked, combat-style sights
  • External extractor; loaded chamber indicator
  • Improved front and rear cocking serrations
  • Sight Protecting Slide Cap


  • Cold hammer-forged stainless steel
  • Recessed target crown
  • Polished chamber and feed ramp


  • Polymer construction with replaceable steel frame/slide rails
  • Enhanced grip texture which enables faster follow-up shots in all conditions
  • Interchangeable backstraps
  • MIL-STD-1913 accessory mounting rail
  • Improved flatter face trigger

Operating Controls:

  • Fully ambidextrous slide stop lever and magazine release


  • High visibility, low-friction follower; polymer base with black finish
  • Compatible with FN 509 17-round and 24-round magazines with appropriate magazine sleeves


Caliber: 9mm

Operation: Double-action

Mag Capacity: 17 Rd.

Weight: 26.9 oz.

Barrel Length: 4.0"

Overall Length: 7.4"

Twist Rate: 1:10" RH

Height: 5.75"

Width: 1.35"

Trigger Pull: 5.5 - 7.5 lb.

Sight Radius: 5.79"

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