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The FN 509 Tactical FDE is the kind of pistol that doesn't ask you to add much before it's ready for serious work. Right out of the box you get a threaded barrel, an optics-ready slide, and suppressor-height night sights that actually co-witness with a mounted red dot. The 4.5-inch cold hammer-forged stainless-steel barrel is threaded 1/2×28 with a recessed target crown, a polished chamber and feed ramp, and an O-ring retention thread cap that keeps things tight during rapid fire. The polymer frame is finished in full FDE, runs a MIL-STD-1913 accessory rail up front, and comes with interchangeable backstraps so you can dial in the grip for your hand size. Fully ambidextrous slide stop and magazine release means left-handed shooters don't have to compromise a thing.
FN's Low-Profile Optics Mounting System is genuinely one of the better factory optics solutions on the market. It ships with mounting plates that cover the most popular MRD footprints including RMR, DeltaPoint Pro, Vortex Venom, and more, so virtually any mainstream pistol red dot you're likely to buy will mount without additional machining or third-party adapters. When you're running it iron-sight only, the included slide cap has raised protective wings that guard the sights and double as a racking surface against a belt or boot edge. The Trijicon 3-dot green tritium suppressor-height sights sit tall enough to stay visible over most cans and co-witness cleanly with a mounted optic.
This pistol has a well-documented reliability record and cycles smoothly across a wide variety of 9mm ammunition. The grip texture is aggressive enough to maintain control in wet or adverse conditions without being uncomfortable during extended range sessions. The trigger runs 5.5 to 7.5 pounds, which is on the heavier side compared to some competition-oriented striker guns, but that weight contributes to the kind of consistency you want in a duty or home-defense setup. The 509 Tactical platform as a whole has been tested to over one million rounds during FN's development process, and the civilian version carries those same engineering standards forward.
The 10-round magazine configuration on this specific model (MPN 66-100383) makes it the version many buyers seek out, and it ships with two magazines plus an FN logo soft pistol case and a locking device.
FN's Low-Profile Optics Mounting System ships with multiple mounting plates that cover the most popular miniature red dot footprints, including Trijicon RMR, Leupold DeltaPoint Pro, Vortex Viper, Vortex Venom, Burris FastFire, Doctor Optic, and CMore STS II, among others. The key advantage is that no direct slide milling is required, so you can swap between optics as your needs change. The suppressor-height night sights are also tall enough to co-witness with most mounted red dots.
Yes. The barrel is threaded 1/2×28 from the factory, which is the standard pitch that fits the vast majority of 9mm suppressors on the market. It also includes a thread protector cap with an integrated O-ring that prevents the cap from backing off during use. The included Trijicon suppressor-height sights ensure you maintain a usable sight picture even with a can attached.
This model (MPN 66-100383, UPC 845737009144) ships with two 10-round magazines. The FN 509 Tactical platform is also compatible with 17-round and 24-round magazines if you want to run higher-capacity mags at the range, making it a flexible setup depending on your needs.
No, this model does not include a manual thumb safety. Like most modern duty-grade striker-fired pistols, it relies on internal passive safeties including a trigger safety, drop safety, and a disconnect safety that prevents firing out of battery. Many users in duty and home-defense roles actually prefer this configuration for consistent, unimpeded access under stress.
It's one of the more genuinely ambidextrous full-size pistols available. Both the slide stop lever and the magazine release are fully ambidextrous out of the box with no swapping or modification required. That's a meaningful advantage over platforms where you have to buy aftermarket parts or perform modifications to get true left-handed functionality.
The Tactical model adds several features the standard 509 does not have: a threaded cold hammer-forged barrel, the Low-Profile Optics Mounting System with optics-ready slide, suppressor-height Trijicon tritium night sights, and enhanced front and rear cocking serrations. If you plan to run a red dot, a suppressor, or both, the 509 Tactical is purpose-built for that and handles it without any aftermarket modification.
| UPC | 845737009144 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-100383 |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 4.5" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Color | Flat Dark Earth |
| Length | 12.5 |
| Number of Magazines | 2 |
| Package Height | 3.5 |
| Package Width | 11.5 |
| Product Type | Pistol |
| Safety | No |
| Shipping Weight | 3.9 |
| Sights | 3-Dot Night/Suppressor Height |
| Sights Type | 3-Dot Night/Suppressor Height |
| Slide Description | Optic Cut/Serrated |
| Units per Box | 1 |
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