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FN built a serious reputation with the 509 platform, and the 509C MRD is the compact version that doesn't apologize for how much it brings to the table. Chambered in 9mm with a 3.7-inch cold hammer-forged stainless steel barrel featuring a recessed target crown and polished feed ramp and chamber, this is a carry gun that was engineered to run reliably, not just look good on paper. The slide and barrel both receive FN's ferritic nitrocarburizing (FNC) finish, which gives the black version excellent corrosion and wear resistance for hard, everyday use.
The MRD designation is the main event here. FN's patented Low-Profile Optics Mounting System uses plate adapters to support direct mounting of more than 10 miniature red dot optics, and the setup is notably well thought out. A rubber O-ring sits between the mounting plate and slide to keep tension on the screws, and FN uses proprietary fasteners sized to each optic with oversized heads to prevent stripping. The all-black suppressor-height iron sights co-witness with whatever optic you run, so you're not giving anything up when you go glass. If you haven't mounted an optic yet, the iron sights stand on their own just fine.
The frame side of things is equally well-equipped. Fully ambidextrous controls, including both the slide stop lever and magazine release, make this genuinely usable left- or right-handed. Two interchangeable backstraps let you dial in the grip fit, and the texturing on the frame provides solid purchase without being overly aggressive for daily carry. The MIL-STD-1913 Picatinny rail up front is long enough to mount a compact weapon light and still leave room for most popular options. A loaded chamber indicator and external extractor round out the slide features.
This particular SKU ships with two 10-round magazines, two interchangeable backstraps, a locking device, owner's manual, and an FN logo soft pistol case. The pistol is also compatible with higher-capacity FN 509 magazines, so capacity can be increased with the appropriate magazines when running it at the range. Whether you're setting this up as a carry gun with an optic or running it as-issued with iron sights, the 509C MRD gives you a lot of options in a platform that FN has refined over years of commercial and law enforcement use.
FN's Low-Profile Optics Mounting System uses interchangeable plate adapters to support direct mounting of more than 10 commercially available miniature red dots, covering most of the popular footprints on the market. The system uses an O-ring and proprietary fasteners sized to each specific optic to keep everything secure under recoil. You do not need to have the slide milled, which keeps your options open if you ever want to switch optics down the road.
Yes. The 509C MRD ships with suppressor-height all-black iron sights that co-witness with mounted miniature red dots. FN's optics mounting system uses plates and inserts of varying thickness so that the iron sights co-witness regardless of which optic you run. If you choose to carry without an optic, the irons work perfectly well on their own.
The 509C MRD requires holsters specifically designed or designated as compatible with the FN 509 Compact MRD. If you plan to run a mounted optic, you need a holster that is explicitly optics-cut, since a standard closed-top holster will not clear the optic. Many Kydex IWB and OWB holsters from reputable makers are available for this model, and most that are optics-compatible will also accommodate a compact weapon light on the rail.
Yes. The 509C MRD is compatible with all FN 509 platform magazines, so you can run higher-capacity options for range use. This SKU ships with two 10-round magazines, but FN 509 12-round and 15-round magazines will also fit and function in this pistol. The 12-round mag gives you a flush fit while the 15-rounder extends the grip slightly.
No, the 509C MRD does not include a manual safety. It relies on the internal safeties built into the striker-fired action, which is consistent with how most modern duty and carry pistols are set up. If a manual safety is a must-have for you, this is not the right configuration.
The standard FN 509C and the 509C MRD share the same compact frame and 3.7-inch barrel, but the MRD version features the optics-ready slide with FN's Low-Profile Optics Mounting System and plate adapters for miniature red dots. The MRD also comes with suppressor-height iron sights to co-witness with a mounted optic, whereas the base 509C uses lower-profile sights and does not have the optics mounting system cut into the slide.
| UPC | 845737010898 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-100572 |
| Action | |
| Barrel Length | 3.7" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Color | Black |
| Number of Magazines | 2 |
| Safety | No |
| Sights | Iron |
| Sights Type | Iron |
| Slide Description | Optic Ready/Serrated |
| ATF Type | Pistol |
| Length | 11.5 |
| Package Height | 2.5 |
| Package Width | 8.5 |
| Product Type | Semi-Auto Pistol |
| Shipping Weight | 3.15 |
| Units per Box | 1 |
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