Description
The FN 509 Midsize Tactical Handgun 9mm Luger 10rd Magazines (2) 4.5″ Threaded Barrel FDE NMS is a suppressor-ready, red-dot-ready semi-auto built for concealed carry, home defense, and duty. It ships with two 10-round magazines and a 4.5-inch threaded barrel in Flat Dark Earth, giving you a multi-role platform that balances shootability with concealability. Per FN specs, the trigger breaks clean at around 5 pounds, and the slide is milled for the FN Low-Profile Optics Mounting System (NMS).
| Manufacturer | FN America |
|---|---|
| Model | FN 509 Midsize Tactical NMS |
| Material | Stainless steel barrel, polymer frame (per manufacturer specs) |
| Compatibility | FN 509 series holsters and optics with NMS footprint |
| Finish | Flat Dark Earth (FDE) polymer frame, black nitride slide |
| Weight | 28.2 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 4.5″ Threaded Barrel: Lets you run a suppressor or compensator right out of the box, reducing muzzle rise and noise signature for faster follow-up shots.
- FN Low-Profile Optics Mounting System (NMS): The slide is pre-milled for direct-mount optics without adapter plates, so you can co-witness your red dot with the tall iron sights.
- Flat Dark Earth Polymer Frame: The FDE finish resists glare and matches popular tactical gear, while the textured grip gives you a locked-in hold even with wet hands.
- Two 10-Round Magazines Included: You get two flush-fit 10-rounders for compliance in restricted states, plus the option to run standard-capacity mags where legal.
- 5-Pound Trigger with Clean Break: The flat-faced trigger has a short reset and consistent pull weight, helping you stay on target during rapid strings.
Who It’s For
This handgun is for shooters who want one gun that does everything: concealed carry, home defense, and occasional competition. If you run a suppressor or red dot and need a compact frame that still fits inside the waistband, the 509 Midsize Tactical delivers. It also suits shooters in 10-round-capacity states who need a factory-compliant option without aftermarket modifications.
Pros and Cons
- Pro: Factory-milled slide for optics saves you the cost and hassle of aftermarket machining.
- Pro: Threaded barrel is standard, not an add-on, so you don’t pay extra for suppressor readiness.
- Con: The 10-round magazines limit capacity compared to the standard 17-rounders, though you can swap mags if your state allows.
- Con: The grip texture is aggressive—some shooters may find it too rough for concealed carry against bare skin.
Comparison: FN 509 Midsize Tactical vs. Zev Technologies OZ9 vs. Agency Arms Syndicate
| Feature | FN 509 Midsize Tactical | Zev Technologies OZ9 | Agency Arms Syndicate |
|---|---|---|---|
| Barrel Length | 4.5″ threaded | 4.5″ threaded | 4.6″ threaded |
| Magazine Capacity | 10 rounds (included) | 17 rounds (included) | 17 rounds (included) |
| Optics Mount | FN NMS (direct mount) | RMR footprint (direct mount) | RMR footprint (direct mount) |
| Trigger Pull | ~5 lbs (per FN specs) | ~4.5 lbs (per Zev specs) | ~4.5 lbs (per Agency specs) |
| Price | $929 | $1,699 | $1,499 |
| Best For | Budget-conscious tactical shooters in restricted states | Competition and high-round-count users | Custom build enthusiasts |
According to FN specs, the 509 Midsize Tactical uses a stainless steel barrel and a proprietary recoil spring assembly tuned for suppressed fire. One honest drawback: the trigger, while crisp, has a slightly longer reset than aftermarket triggers from Timney or Geissele—something to consider if you’re used to competition triggers.
Frequently Asked Questions
Does the FN 509 Midsize Tactical come with suppressor-height sights?
Yes. The pistol ships with tall iron sights that co-witness with most red dot optics mounted via the NMS system. The front sight is a green fiber optic, and the rear is a black serrated notch.
Can I use standard 17-round magazines in this 10-round model?
Yes. The FN 509 Midsize Tactical accepts all FN 509-series magazines. The 10-rounders are flush-fit, but 17-round, 24-round, and 10-round extended magazines work without modification. Check your local laws before swapping.
Is the barrel compatible with a standard 1/2×28 suppressor?
Yes. The 4.5-inch threaded barrel has a 1/2×28 thread pitch, matching the majority of 9mm suppressors and compensators on the market. FN includes a thread protector cap in the box.
What optics fit the FN NMS mounting system?
The NMS footprint is designed for the FN Reflex and 509 series. Optics like the Holosun 407/507K, Trijicon RMRcc, and Shield RMSc fit with the included adapter plate. FN recommends using their direct-mount plate for the best co-witness.
Trust & Delivery
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Last updated: April 2026
Browse more handguns in our Semi Auto Handguns category, check out FN Handguns, or explore Suppressor-Ready Pistols.
Reviews
There are no reviews yet.