Description
The FN 509M Tactical 9mm 4.5in Holosun 407C Black 15/24rd is a midsize semi-auto pistol that ships with a factory-mounted Holosun 407C red-dot sight, a threaded cold hammer-forged stainless steel barrel, and two magazines (15- and 24-round). Built for training, duty, and range use, this striker-fired 9mm runs on FN’s low-profile optic mounting system and suppressor-height 3-dot night sights. Controls are fully ambidextrous, and the frame uses interchangeable backstraps for a tailored grip.
| Manufacturer | FN America |
|---|---|
| Model | FN 509M Tactical |
| Material | Cold hammer-forged stainless steel barrel, polymer frame (per manufacturer specs) |
| Compatibility | Holosun 407C red-dot (factory-mounted), suppressor-height night sights, threaded barrel (1/2×28) |
| Finish | Black nitride slide, black polymer frame |
| Weight | 26.6 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- Factory-Mounted Holosun 407C — No aftermarket fitting or adapter plates needed. The 2 MOA dot is ready out of the box, saving you time and money on a separate optic and installation.
- Threaded Cold Hammer-Forged Barrel with Recessed Target Crown — This barrel delivers sub-2-inch groups at 25 yards per FN’s accuracy standard. The 1/2×28 threads accept standard suppressors or compensators without a booster if the pistol is run in fixed-barrel mode.
- FN Low-Profile Optic Mounting System — The slide is machined to accept the Holosun 407C directly, keeping the optic low enough to co-witness with the suppressor-height night sights. No lost zero from loose plates.
- Fully Ambidextrous Controls — Slide stop/release and magazine release are mirrored on both sides. Lefties and righties get the same speed on reloads and slide manipulations.
- Interchangeable Backstraps — Three sizes (small, medium, large) let you dial in palm swell and trigger reach without swapping the whole grip module.
Who It’s For
This pistol is for the shooter who wants a suppressor-ready, red-dot-equipped duty pistol without spending extra on aftermarket milling or a separate optic. It fits anyone running a home-defense gun with a can, a competition rig in Carry Optics division, or a training pistol that can handle high-round-count classes. The 24-round magazine makes it a solid choice for USPSA or IDPA matches where capacity matters.
Pros & Cons
- Pro: Factory-mounted Holosun 407C saves $200–$300 over buying the optic and a mounting plate separately.
- Pro: Cold hammer-forged barrel is overbuilt for extended strings of fire without accuracy loss.
- Pro: Ambidextrous controls mean no modification needed for left-handed shooters.
- Con: The trigger pull is heavier than aftermarket options—around 5.5–6 lbs out of the box. If you prefer a sub-4 lb trigger, you’ll need to swap in an Apex or Overwatch Precision trigger shoe.
Comparison: FN 509M Tactical vs. Zev Technologies OZ9 vs. Agency Arms AOS Glock 19
| Feature | FN 509M Tactical | Zev Technologies OZ9 | Agency Arms AOS Glock 19 |
|---|---|---|---|
| Optic System | Factory-mounted Holosun 407C (included) | RMR-cut slide (optic not included) | Agency Optic System (optic not included) |
| Barrel | Cold hammer-forged, threaded, 4.5in | Match-grade stainless, threaded, 4.5in | Match-grade stainless, threaded, 4.0in |
| Magazines | 15 & 24 rounds | 17 & 21 rounds | 15 & 17 rounds |
| Price (approx.) | $1,059 | $1,400+ | $1,500+ |
| Best For | Budget-conscious shooters wanting a complete RDS setup | Competition shooters who customize their own optic | Duty users who want Agency’s proven slide cut |
FAQ
Does the FN 509M Tactical come with the Holosun 407C already mounted?
Yes. The pistol ships with the Holosun 407C factory-mounted on the slide using FN’s low-profile mounting system. It is zeroed at 25 yards from the factory.
What thread pitch is the barrel?
The barrel is threaded 1/2×28, which is standard for 9mm suppressors and compensators.
Can I use the 24-round magazine in a standard FN 509?
Yes. The 24-round magazine is compatible with all FN 509 models, including the standard 509 and 509 Compact.
Does the Holosun 407C co-witness with the iron sights?
Yes. The suppressor-height 3-dot night sights co-witness with the 407C’s lower 1/3 of the window.
What is the warranty on this pistol?
FN America covers the FN 509M Tactical with a limited lifetime warranty against defects in materials and workmanship.
Why Buy From Us
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1-2 business days
- ✓ 30-day returns
- ✓ Secure checkout
Last updated: April 2026
Browse more: Semi Auto Handguns | FN Handguns | Optics-Mounted Pistols
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