Your EDC just got better with the all-new FN 509 Midsize MRD. This evolution of the FN 509 Midsize, now featuring the FN Low Profile Optics Mounting System, gives you the option of direct mounting more than 10 different miniature red dot optics to your concealed carry pistol. The FN 509 Midsize MRD features a four-inch barrel and slide with optics mounting package, a midsize frame, standard 15-Round capacity and is compatible with larger capacity FN 509 magazines with 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.
Features:
- FN Low Profile Optics Mounting System with plate adapters for direct mounting of more than 10 optics
- Aggressive FN 509 slide serrations for improved manipulation
- 4-inch Cold hammer-forged barrel with Recessed target crown & Polished chamber and feed ramp
- Shortened grip for easier concealment and enhanced grip texture which enables faster follow-up shots in all conditions
- All-black co-witness iron sights
- External extractor; loaded chamber indicator
- Interchangeable backstraps
- MIL-STD-1913 accessory mounting rail
- Improved flatter face trigger
- Fully ambidextrous slide stop lever and magazine release
- FN Soft Case Included
- Compatible with FN 509 17-Round and 24-Round magazines with appropriate magazine sleeves. *
Additional Specs:
- Action: Double Action (DA)
- Finish: Black
- Sights: All-Black Co-witness Iron Sights
- Frame Size: Midsize
- Compatible Optics: Trijicon RMR, Leupold DeltaPoint Pro, Vortex Razor, Viper, Venom, Burris FastFire II, III, Docter Optic, C-More STS II, And More
- Magazines: Two 15-Round *
Manufacturer’s Part Number: 66-100587
* Restricted States and localities will receive no magazine if the magazines are above the local limit
Buying and shipping through Charlie’s is easy, but there is some information you need to know. This item must ship to FFL holder. No civilian exceptions.
1) Check your state laws to make sure the federally regulated item you want to purchase is legal in your state.
2) Find your FFL… Have your dealer send us a copy of their FFL to Charlie’s (Make them earn their fee!!!)
3) Be patient! You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.
That’s it! We try to make this process as simple as possible for our customers. Please click the “Buying a Firearm” tab at the top of this page for more information.
CALIFORNIA RESIDENTS: Please check the Attorney General’s site for approved pistols before ordering.










