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66-100465 FN 509M Mid-Size w/ Night Sights & 2 15rd Magazines

Manufacturer: FN
SKU: FN66-100465
Manufacturer part number: 66-100465
UPC: 845737010034
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FN 509M (66-100465) Mid-Size w/ Night Sights & 3 15-round Magazine offers the perfect combination of a midsize frame with a four-inch slide barrel, allowing it to retain the performance of full-size pistols in a considerably smaller package. This 9mm platform comes with a 15-round capacity and works with all of FN's 509 magazines.

FN wanted to create a compact pistol that would provide users with the performance of its full-size counterparts. To this end, the firearm features a double-action operation, a fixed 3-dot green tritium night sight, non-manual safety models, and a striker-fired autoloader.

The barrel is made of cold hammer-forged stainless steel with a polished chamber. And the slide is easy to rack and features combat-style sights. FN has also made significant improvements to the front and rear cocking systems for added peace of mind. The frame is a polymer construction for high strength and lightweight. And it comes with replaceable steel slide rails.

Features of the FN 509 Mid-Size w/ Night Sights & 3 15-round Magazine

  • Optimal combination of small size with performance of full-size pistols
  • Cold hammer-forged stainless steel barrel
  • 15-round capacity
  • Compatible with all FN 509 magazines

This ideal combination of a four-inch slide and barrel with a midsize frame retains full-sized pistol performance in an easily-concealed package. The 9mm pistol ships standard with a 15-round capacity and is compatible with all 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:

  • Full-sized performance in a concealed carry package
  • Striker-fired autoloader
  • Double-action operation
  • Fully ambidextrous controls
  • Offered as a non-manual safety model
  • Fixed 3-dot green tritium night sight


  • Easily racked, combat-style sights
  • External extractor; loaded chamber indicator
  • An improved front and rear cocking serrations


  • 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


Caliber: 9mm

Operation: Double-action

Mag Capacity: 15 Rd.

Weight: 26.5 oz.

Barrel Length: 4.0"

Overall Length: 7.4"

Twist Rate: 1:10" RH

Height: 5.2"

Width: 1.35"

Trigger Pull: 5.5 - 7.5 lb.

Sight Radius: 5.79"