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The FN FNX-45 Tactical traces its roots directly to the U.S. Joint Combat Pistol Program, and that lineage shows in every detail. This particular configuration pairs the Tactical's signature optic-ready stainless steel slide and suppressor-height tritium night sights with a 4.5" non-threaded stainless steel barrel, giving you a full-feature Tactical package without the threaded muzzle. Chambered in .45 ACP and finished head to toe in Flat Dark Earth, it runs on a DA/SA hammer-fired action with a trigger pull ranging from around 8.8-12.1 lbs double action to 3.96-5.06 lbs single action. The checkered polymer frame sits on a low bore axis that helps manage felt recoil, and the natural grip angle makes it one of those pistols that just points well from the moment you pick it up.
The stainless steel slide on this pistol is the real story. FN machines it at the factory with their Low-Profile Optics Mounting System, which accepts over ten different micro red dot footprints through the included adapter plates. The raised 3-dot Trijicon tritium night sights are tall enough to co-witness with most common optics, so you're not giving up your irons when you add a dot. Front and rear cocking serrations give you solid purchase for press checks and administrative handling, and an external extractor doubles as a loaded chamber indicator.
FN made every major control on this pistol ambidextrous, including the thumb safety/decocker, slide stop, and magazine release. That's not a minor thing: a lot of guns claim to be ambi-friendly but only halfway commit. The FNX-45 Tactical does it right, and it makes a real difference for left-handed users and cross-trained shooters. Multiple interchangeable backstraps let you dial in the grip fit, and a MIL-STD-1913 Picatinny rail on the dust cover accepts any standard weapon light or laser without adapters. With 33.3 oz. unloaded, it carries the weight you'd expect from a duty-grade .45, balanced enough to handle but substantial enough to eat recoil without drama.
No. This specific configuration (MPN 66-100223, UPC 845737009052) features a 4.5" non-threaded stainless steel barrel. FN does offer a separate Tactical variant with a 5.3" threaded barrel, so make sure you're looking at the right model number before purchasing. That said, the night sights on this pistol are still raised to suppressor height, which helps with co-witnessing if you add a red dot.
The factory-milled slide uses FN's Low-Profile Optics Mounting System, which ships with adapter plates to accommodate over ten different micro red dot footprints. The Trijicon RMR footprint is the most commonly used direct fit, and optics like the Holosun 507C and Vortex Viper are also popular choices with the included plates. The suppressor-height tritium night sights co-witness with most compact red dots, so you retain a usable iron sight picture even when running a dot.
The first shot from a decocked hammer fires in double action, which means a longer, heavier pull in the 8.8-12.1 lb range. After that first round, the slide cycles and cocks the hammer, so follow-up shots fire in single action at a much lighter and shorter 3.96-5.06 lb pull. The ambidextrous thumb safety also functions as a decocker, letting you safely lower the hammer without dry-firing when you're done shooting.
It's one of the better factory options for lefties. The manual safety/decocker, slide stop, and magazine release are all fully ambidextrous, meaning they're mirrored on both sides of the frame, not just extended on one side. Combined with the interchangeable backstraps for grip customization, it's a pistol that genuinely works for either hand without modification.
The dust cover features a MIL-STD-1913 Picatinny rail, which is the industry standard and accepts the full range of common weapon-mounted lights and lasers without any adapters. Lights from Streamlight, SureFire, Fenix, and similar brands fit right onto the rail, making it easy to set up for home defense or duty use.
This 10-round configuration ships with two 10-round magazines. It also includes the optic mounting kit with adapter plates, interchangeable backstraps, a soft Cordura nylon case, a locking device, and an owner's manual. FN packages this variant well for what you get out of the box.
| UPC | 845737009052 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-100223 |
| Action | |
| Barrel Length | 4.5" |
| Caliber/Gauge | .45 ACP |
| Capacity | 10 |
| Color | Flat Dark Earth |
| Model | |
| Product Type | Double / Single Action |
| Safety | Ambidextrous/Decocker |
| Shipping Weight | 6.2 |
| Sights | Fixed 3-Dot Night |
| Sights Type | Fixed 3-Dot Night |
| Slide Description | Optic Cut/Serrated |
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