FN 509 LS Edge 9mm 5-inch Long Slide, Optics-Ready
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About this product
The FN 509 LS Edge 9mm 5-inch long slide, optics-ready is a serious precision shooter's tool. This factory-tuned pistol comes with a hammer-forged, target-crowned barrel and a flat-face trigger right out of the box. It's built for competition, demanding range work, and anyone who wants to squeeze the most accuracy out of a 9mm.
| Manufacturer | FN America |
|---|---|
| Model | 509 LS Edge |
| Material | Stainless steel barrel, polymer frame (per manufacturer specs) |
| Compatibility | FN 509 magazines, optics with RMR footprint |
| Finish | Black nitride barrel, black polymer frame |
| Weight | 28.3 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 5-inch hammer-forged, target-crowned barrel — This gives you match-grade accuracy and consistent shot placement, even at longer ranges. The target crown protects the rifling and helps maintain precision.
- Low-profile optics mounting system — It accepts most red dots with an RMR footprint without needing a plate. That means you can mount your optic directly to the slide for a lower bore axis and faster target reacquisition.
- Fiber-optic front sight — The bright green fiber front stands out against the black serrated rear, helping you pick up the front sight quickly in any lighting. It's a huge help for competition stages where speed matters.
- Flat-face trigger — The trigger breaks clean and resets short, which cuts down on trigger pull variation. You'll see tighter groups and faster follow-up shots, especially under pressure.
- Flared aluminum magazine well and lightening cuts — The mag well speeds up reloads, and the slide cuts reduce muzzle flip. Together, they keep the gun balanced and running fast.
Who It's For
This is for the shooter who wants a factory-built competition or precision range pistol without having to send it off for custom work. It's also a great fit for anyone who wants an optics-ready 9mm with a longer sight radius for better accuracy. Newer shooters who want to step up from a basic duty gun will appreciate the flat trigger and fiber optic sight. Experienced competitors will like that it's ready for a red dot right away.
Pros and Cons
- Pros: Factory-tuned flat trigger, direct-mount optics system, target-crowned barrel, flared mag well, lightening cuts reduce recoil.
- Cons: The grip texture is a bit aggressive for concealed carry — this is really a range and competition gun, not a daily carry piece.
Comparison
| Feature | FN 509 LS Edge | Zev Technologies OZ9 | Agency Arms AOS G19 |
|---|---|---|---|
| Barrel length | 5 inches | 4.49 inches | 4.02 inches |
| Trigger | Flat-face, factory tuned | Flat-face, adjustable | Flat-face, aftermarket |
| Optics mounting | Direct mount, RMR footprint | Plate system | Plate system |
| Weight (unloaded) | 28.3 oz | 24.5 oz | 21.7 oz |
| Price | $758.87 | $1,200+ | $1,100+ |
FAQ
What optics will fit the FN 509 LS Edge?
It comes with FN's low-profile mounting system that accepts optics with an RMR footprint. That includes Trijicon RMR, Holosun 407C/507C/508T, and similar models. You can mount them directly to the slide with the included screws — no adapter plate needed.
Is this pistol good for concealed carry?
The 5-inch slide and full-size frame make it a bit large for everyday concealed carry. It's really built for competition and range use. If you're looking for a carry gun, the standard FN 509 Compact might be a better fit. But for a range or competition gun, the LS Edge is hard to beat.
How does the trigger feel compared to a stock FN 509?
The LS Edge has a flat-face trigger with a lighter pull and a shorter reset than the standard 509. It breaks around 4.5 to 5 pounds (per manufacturer specs) and has a crisp, clean break. It's a noticeable upgrade for precision shooting.
Does it come with a threaded barrel?
No, the barrel is a 5-inch target-crowned barrel, not threaded. If you want to run a suppressor, you'd need to swap the barrel. The target crown helps with accuracy, so it's a trade-off for competition shooters.
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Last updated: April 2026