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The FN 509 Tactical is one of those pistols that earns its reputation by actually delivering on every feature it advertises. It started life as FN's entry into the U.S. Army's Modular Handgun System competition, and while a different pistol won that contract, FN took everything they learned and built it into a commercial platform that's become a go-to for law enforcement, home defense, and enthusiasts who want a full-size tactical pistol that's genuinely ready for whatever they want to attach to it.
The barrel is where a lot of that value shows up. FN uses their cold hammer-forged stainless steel process here, cutting a 4.5-inch barrel with a recessed target crown and 1/2×28 threads that work with the vast majority of 9mm suppressors on the market. The thread cap itself includes a rubber O-ring so it stays put under use. The slide is steel, finished in matte black, with front and rear cocking serrations that are sharp enough to actually grip. When there's no optic mounted, the included slide cap has raised wings that protect the irons and give you a solid surface for one-handed racking against a belt or boot.
FN's patented Low-Profile Optics Mounting System is genuinely one of the better solutions in the industry. It accepts over ten different miniature red dot sights without any slide milling, and the suppressor-height tritium night sights co-witness with mounted optics so you're never left without a usable sight picture. The MIL-STD-1913 Picatinny rail out front handles weapon lights and lasers without any adapters. Fully ambidextrous magazine release and slide stop mean left-handed shooters get a truly usable setup, not a reversed button that still favors a righty.
The frame is polymer with interchangeable backstraps so you can dial in the grip fit to your hand size. The grip texture is aggressive enough to stay put in adverse conditions without being punishing over a long range session. Trigger pull runs 5.5 to 7.5 pounds, which is on the heavier side for a striker-fired pistol, but it's consistent and purposefully designed for duty-safe use. This is a full-size pistol at 7.9 inches overall and 27.9 ounces, so it's best suited for home defense, duty carry, or range use rather than everyday concealed carry.
FN's patented Low-Profile Optics Mounting System is compatible with over ten different miniature red dot sights, including popular options from Trijicon, Holosun, Leupold, and Vortex. The system uses included adapter plates and hardware to mount directly to the slide without any milling required. The suppressor-height night sights co-witness with mounted optics, so you keep a usable iron sight picture even with a red dot on board.
This specific model (MPN 66-100527) ships with two 10-round magazines. Other configurations of the 509 Tactical are available with higher-capacity magazines, so if you're shopping for the standard-capacity version, make sure you're looking at the right model number. The pistol itself is fully compatible with higher-capacity FN 509 magazines where permitted.
It's one of the better factory options out there for running a suppressor. The 4.5-inch barrel is threaded at 1/2×28, which is the standard pitch that works with the majority of 9mm suppressors on the market. The suppressor-height tritium night sights mean you can still see your target picture over the top of a can, and a second recoil spring assembly is included for tuning the action when running suppressed.
No, it does not have an external manual safety. Instead, it uses four passive safety systems built into the action: a trigger safety, a striker block, a drop safety, and a trigger disconnect. This is a common and well-regarded setup for duty and defensive pistols, keeping the draw-to-fire sequence clean while still protecting against unintended discharges.
The pistol comes with interchangeable backstraps in flat and arched profiles, letting you adjust the grip to better fit your hand size without any gunsmithing. Swapping them out is straightforward, and the difference in feel is noticeable, especially for shooters on the smaller or larger end of average hand sizes. The grip texture itself is fairly aggressive, which helps maintain control in wet or gloved conditions.
Yes, and this is one of the genuine standout features of the platform. Both the magazine release and the slide stop lever are fully ambidextrous, meaning they work from either side without having to swap any parts. Nothing needs to be reconfigured out of the box, which makes this a notably strong option for left-handed shooters who are used to fighting with right-handed pistol controls.
| UPC | 845737010195 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-100527 |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 4.5" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Color | Black |
| Length | 12 |
| Number of Magazines | 2 |
| Package Height | 3.5 |
| Package Width | 11.5 |
| Product Type | Pistol |
| Safety | Loaded Chamber Indicator |
| Shipping Weight | 3.9 |
| Sights | Suppressor Height Night Sights |
| Sights Type | 3-Dot Night/Suppressor Height |
| Slide Description | Optic Ready/Serrated |
| Units per Box | 1 |
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