FN 509C MRD Compensated 9mm FDE | 4.02 in | 66101794

The FN 509 Compact MRD Compensated is a compact, optics-ready 9mm pistol with an integrated compensator and FN’s Low-Profile Optics Mounting System. It ships in Flat Dark Earth and includes two magazines for varied capacity options. Controls are configured for ambidextrous use and the slide features aggressive serrations for positive manipulation.

A suitable optic under $1,000 for this platform is the Holosun 507K series, which is sized to work with FN’s low-profile mounting plates while keeping footprint and height compatible with co-witnessed iron sights. Typical applications for this pistol include everyday concealed carry and range training/competition where reduced muzzle flip and fast follow-up shots are priorities.

Product Specifications

• The UPC is 845737017842.
• The model is FN 509 Compact MRD Compensated.
• The manufacturer part number is FN 66101794.
• The caliber is 9mm.
• The barrel measures 4.02 inches.
• The overall length is 7.4 inches.
• The weight is 25.5 oz..
• The frame material is polymer.
• The finish is Flat Dark Earth PVD.
• The pistol includes one 12-round and one 15-round magazine.
• The optic mounting system supports multiple miniature red-dot footprints.
• The sights are all-black co-witness iron sights.
• The barrel type is compensated.
• The number of magazines included is 2.
• The rate of twist is 1-in-10.

This compact FN 509 variant combines reduced muzzle flip and a low-profile optic solution in a carry-oriented package. The compensated barrel and enhanced grip texture aim to speed follow-up shots, while the optics cut and co-witness sighting make it straightforward to mount a red dot and retain iron-sight capability. Its blend of features makes it a practical choice for concealed carry and tactical-style range work.

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