Description
The FN 509 Midsize Tactical 9mm Holosun 407C, 4.50 in is a factory-ready, red-dot-equipped service pistol that combines duty-grade reliability with a compact enough profile for range training and practical carry. It ships with the Holosun 407C already mounted, two 17-round magazines, a hard case, and suppressor-height night sights—so you’re ready to shoot right out of the box.
| Manufacturer | FN America (per manufacturer specs) |
|---|---|
| Model | 509 Midsize Tactical |
| Material | Cold hammer-forged stainless steel barrel, polymer frame |
| Compatibility | Holosun 407C red dot, suppressor-height night sights, standard FN 509 magazines |
| Finish | Black nitride slide, matte black frame |
| Weight | 26.5 oz (unloaded, with optic per manufacturer specs) |
| Condition | New |
Key Features
- Factory-Installed Holosun 407C: This is the biggest time-saver for new shooters—no need to buy a separate optic or pay a gunsmith to mount it. The 2 MOA red dot is crisp and easy to pick up, even for someone new to red dots.
- Cold Hammer-Forged Barrel with Recessed Target Crown: FN cold-hammers every barrel, which means it’s tough enough for thousands of rounds and the recessed crown protects the rifling. You’ll see better accuracy round after round.
- Optic-Ready Slide with Enhanced Cocking Serrations: The slide is cut for low-profile optics, and the deep front and rear serrations give you a solid grip when racking the slide—even with sweaty or gloved hands.
- Fully Ambidextrous Controls: Slide stop, magazine release, and manual safety are all reversible or mirrored, so left-handed shooters in the family can run the gun just as fast as righties.
- Suppressor-Height Night Sights: These tritium sights co-witness with the Holosun 407C, so if your battery dies or the dot washes out in bright sun, you still have a clear sight picture.
Who It’s For
This pistol is built for shooters who want a do-it-all handgun for home defense, range practice, and occasional carry. It’s especially good for beginners because the red dot helps build good sight alignment habits and the mild 9mm recoil is easy to manage. Families teaching new shooters will appreciate the factory-installed optic—it removes one more variable when learning fundamentals.
Pros & Cons
- Pro: The Holosun 407C comes mounted from the factory, saving you $150–$200 and the hassle of installation. Per FN specs, the slide is pre-milled and the optic is torqued to spec.
- Pro: The 4.50-inch barrel balances muzzle velocity with concealability—you get full-power 9mm loads without the bulk of a full-size duty gun.
- Con: The grip texture is aggressive. Some shooters with soft hands might find it rough after a long range session. A light sanding or grip sleeve can tame it if needed.
Comparison
| Feature | FN 509 Midsize Tactical | Zev Technologies OZ9 | Geissele 17 |
|---|---|---|---|
| Price | $1,059 | $1,899 | $1,495 |
| Factory Optic | Yes (Holosun 407C) | No (optic-ready but separate) | No (optic-ready but separate) |
| Barrel Length | 4.50 in | 4.50 in | 5.22 in |
| Capacity | 17+1 | 17+1 | 17+1 |
| Weight (unloaded) | 26.5 oz | 27.1 oz | 29.0 oz |
The FN 509 Midsize Tactical offers the best value for shooters who want a red dot out of the box without jumping to a $1,500+ custom build. The Zev OZ9 and Geissele 17 are excellent, but you’ll spend hundreds more just to get them to the same level of readiness.
FAQ
Does the FN 509 Midsize Tactical come with the Holosun 407C already mounted?
Yes. The pistol ships with the Holosun 407C factory-installed, zeroed, and ready to shoot. You also get the original box, two magazines, a locking device, and the owner’s manual.
Can I use standard FN 509 magazines with this model?
Yes. The Midsize Tactical uses the same 17-round magazines as the full-size FN 509. It also accepts the 24-round extended magazines if you want more capacity for the range.
Is the slide cut for other red dot brands?
The slide is specifically cut for the Holosun 407C/507C and similar footprint optics (like the Trijicon RMR). Per FN specs, you can swap to an RMR or other compatible optic using the included adapter plate—but the 407C is already installed and zeroed.
How do the suppressor-height night sights work with the red dot?
The night sights co-witness with the Holosun 407C, meaning you can see your iron sights through the lower third of the optic window. If the dot fails, you can still aim accurately using the tritium dots.
Is this pistol suitable for a new shooter?
Absolutely. The red dot makes it easier for beginners to learn sight alignment, and the 9mm caliber is low-recoil. The only caveat is the aggressive grip texture—some new shooters may want to wear gloves or add a grip sleeve for comfort during long sessions.
Why Buy from Us
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships in 1–2 business days
- ✅ 30-day return policy
- ✅ Secure checkout
Explore more options in our Semi Auto Handguns collection, or check out Red Dot Sights and FN 509 Parts & Accessories for upgrades.
Last updated: April 2026
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