The pistol features the company’s patent-pending Low-Profile Optics Mounting System™ that enables the platform to accept more than ten commercially-available miniature red dot (MRD) optics that co-witness with the suppressor-height night sights and remain adaptable to future optics releases with no requirement of direct milling of the slide. The slide cap, for use when not shooting with an optic, has raised sight wings that protect iron sight alignment if the pistol is dropped or jostled, and provides a textured ramp for racking the slide against a belt loop, pant pocket or boot.
An FN-signature 4.5-inch, cold hammer-forged, stainless-steel barrel with target crown, ½” x 28 threads that accept the bulk of 9mm suppressors available and thread cap with integrated O-ring to prevent loosening during use complete the top end. Lastly, the 24-round magazines, nearly identical in length to the pistol’s slide, maximize ammunition capacity without impacting carry convenience.
Shown with optional red dot optic.
PRIMARY FEATURES
Striker-fired autoloader
5.5 to 7.5 lbs. Trigger pull
FN Low Profile Optics Mounting System™
Threaded Barrel
Suppressor Height Night Sights
SLIDE
FN Low Profile Optics Mounting System™
Sight Protecting Slide Cap
External extractor; loaded chamber indicator
BARREL
Cold hammer-forged stainless steel
Recessed target crown
Polished chamber and feed ramp
1/2” x 28 threaded Barrel
O-Ring retention thread cap
FRAME
Enhanced grip texture which enables faster follow-up shots in all conditions
Interchangeable backstraps
MIL-STD-1913 accessory mounting rail
OPERATING CONTROLS
Fully ambidextrous slide stop lever
and magazine release
MAGAZINE
High visibility, low-friction follower;
polymer base with black finish
SHIPS WITH
Two interchangeable backstraps
1x 17-round and 1x 24-round magazine
Owner’s manual
Locking device
FN logo soft pistol case
- CALIBER : 9mm
- OPERATION : Double-action
- MAG CAPACITY : 10 or 17/24 Rd.
- WEIGHT : 27.9 oz.
- BARREL LENGTH : 4.5″
- OVERALL LENGTH : 7.9″
- HEIGHT : 5.75″
- WIDTH : 1.35″
- TRIGGER PULL : 5.5 – 7.5 lb.
- SIGHT RADIUS : 5.79″
- WIDTH : 1.35″
- TRIGGER PULL : 5.5 – 7.5 lb.
- SIGHT RADIUS : 5.79″
Buy Firearms Online – Reliable & Affordable
This FN 509 Tactical 9mm, 4.5″ Barrel, Night Sights, Flat Dark Earth, 17rd/24rd FN America is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
Why Choose the FN 509 Tactical 9mm, 4.5″ Barrel, Night Sights, Flat Dark Earth, 17rd/24rd FN America?
- ✅ Quality guaranteed by top firearm manufacturers
- ✅ Ships fast across the USA
- ✅ Legal compliance and background-check ready
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Shipping & Return Policy
- 📦 Fast shipping within 1–3 business days
- 🔁 30-day return policy for unused, unmodified items
- 💬 Questions? Contact our support team
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| Classification | Firearm |
|---|---|
| Manufacturer Number | 66-100373 |
| Brand | FN America |
| interest | Concealed Carry Guns, Target Shooting, 3 Gun Competition, Handguns Sale |




