The FN 509 MRD pistol with a factory-mounted Holosun 407C red dot in 9mm and black finish (brand part no. 66-101927) gives shooters a complete duty-style optic package out of the box rather than a separate optic purchase. FN America builds the pistol with a 4.5-inch cold hammer forged barrel featuring the 509’s signature recessed target crown to protect rifling and maintain accuracy over the pistol’s lifespan. Two 17-round magazines, three interchangeable backstraps, four MRD mounting plates, an FN logo soft case, owner’s manual, and gun lock all ship with the pistol. Among optic-equipped semi-auto handguns, this 509 MRD configuration favors home-defense and duty shooters who want a red dot ready to go.

Key Specifications

• The chambering is 9mm, and the capacity is 17+1 rounds.
• The barrel measures 4.5 inches, cold hammer forged with a recessed target crown.
• A Holosun 407C red dot ships factory-mounted on the pistol.
• Four MRD mounting plates ship with the pistol for optic compatibility.
• Two 17-round magazines and three interchangeable backstraps are included.
• An FN logo soft case, owner’s manual, and gun lock ship with the pistol.
• The sights are Fixed, specifically Optic Height Sights.
• Ships with two magazines.
• The safety is Non-Manual Safety.
• The slide is optic cut/serrated.
• The action is Semi-Auto.
• The design is classified as Striker Fired.

Frequently Asked Questions

Does this pistol come with an optic already mounted? Yes, a Holosun 407C red dot ships factory-mounted.

What else ships in the box? Two 17-round magazines, three backstraps, four MRD mounting plates, a soft case, manual, and gun lock.

Buy the FN 509 MRD Pistol with Holosun 407C

A factory-mounted Holosun 407C red dot ready to shoot right out of the box is exactly what this FN 509 MRD delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.