FN 509C MRD COMP 9mm 4.02″ FDE | 66101795

The FN 509C MRD Compensated is a compact, optic-ready 9mm pistol with an FN auto-indexing compensator and a 4.02″ cold hammer-forged barrel. The slide is cut for low-profile optics and ships with blackout co-witness iron sights. Controls and ergonomics are designed for ambidextrous use and improved recoil management through enhanced texturing and interchangeable backstraps.

Suggested optic: a compact micro red dot such as the Holosun HS507K pairs well with the low-profile mounting system and keeps the build sub-$1000 for the sight. Typical applications include everyday concealed carry and range/training use.

Product Specifications

• The caliber is 9mm.
• The barrel length is 4.02 inches and is compensated.
• The firearm is listed as a semi-auto pistol.
• The frame material is polymer.
• The listed weight is 25.5 oz.
• The finish is Flat Dark Earth.
• The optic footprint accepts multiple popular mini red-dot patterns.
• The sights are listed as all-black co-witness iron sights.
• The pistol includes 2 magazines as an accessory.
• The barrel type is compensated with an FN auto-indexing compensator.
• The package includes a FN logo soft pistol case.
• The grip is a Flat Dark Earth polymer texture with interchangeable backstraps.
• The product type is listed as a Semi-Auto Pistol.
• The slide/frame finish is Flat Dark Earth.
• The UPC is 845737017859.

Compact and focused on controllability, the 509C MRD Compensated brings compensator-assisted muzzle control and an optics-ready slide to a shorter, more-concealable package. The combination of enhanced grip texture, interchangeable backstraps, and co-witness sights makes this a practical choice for shooters who want a compact platform that can accept a miniature red dot while retaining iron sights for redundancy.

Owners and reviewers have described the pistol as delivering “full-size performance in a compact package” and have praised the compensator’s role in reducing muzzle rise for faster follow-up shots.

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