FN 509M MRD Mid-Size 9mm | 4″ | 10-Rd | FN 66100742

The FN 509M MRD is a midsize, optics-ready 9mm pistol with a 4-inch barrel designed for everyday carry and practical use. It uses the FN Low Profile Optics Mounting System to accept multiple miniature red dot footprints and ships with two 10-round magazines. Recommended optic: the Holosun 507K is a compact reflex sight that pairs with the MRD footprint and is available well under $1000 for a low-profile setup.

Common applications for this platform include concealed carry and range training; its midsize frame balances concealability with controllability for regular use.

Product Specifications

• The manufacturer is FN America / FN Herstal.
• The model and part number are FN 66100742.
• The caliber is 9mm Luger.
• The action is Semi-Auto.
• The barrel measures 4 inches.
• The magazine capacity is 10 rounds.
• The pistol includes 2 magazines.
• The frame material is polymer.
• The frame color is Flat Dark Earth.
• The slide finish is Flat Dark Earth PVD.
• The optic footprint supports MULTIPLE miniature red dot optics via the FN Low Profile Optics Mounting System.
• The weight is 26.50 oz.
• The UPC is 845737011574.

The FN 509M MRD pairs a midsize frame with improved controls, interchangeable backstraps, and an optics-ready slide to deliver a practical, adaptable carry package. Its ergonomic features and included magazines make it suited for shooters who want a ready-to-use platform for everyday carry and regular range sessions.

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