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The FN 509M Midsize Tactical sits in a sweet spot that's hard to find in a single pistol. It gives you a grip frame sized for a confident, full-hand hold while trimming the overall footprint enough to make it viable for concealed carry or plainclothes duty use. The 4.5" threaded barrel threads at the standard 1/2×28, so it mates up with the vast majority of 9mm suppressors on the market without adapters. The PVD-finished stainless steel slide is factory-milled for micro red dots, and FN includes the full optics mounting kit with plates, spacers, and hardware for a wide range of popular footprints including Trijicon RMR, Leupold DeltaPoint Pro, and Holosun. No hunting for plates after the fact.
The suppressor-height tritium 3-dot night sights are a standout feature here. They sit tall enough to co-witness with a mounted optic and remain fully usable even when a suppressor is mounted on the barrel. The rear sight is flanked by protective wings that are serrated on the front face, which also doubles as a reliable surface for one-handed slide manipulation in a pinch. FN's cold hammer-forged barrel features a recessed target crown and a polished feed ramp, which contributes to consistent feeding across a wide range of ammunition types, suppressed or not.
The polymer frame runs replaceable steel frame-to-slide rails, which is not something you find on most pistols at any price point. The grip texture is aggressive enough to stay planted during fast follow-up shots without being punishing during extended range sessions. Two interchangeable backstraps let you dial in the fit to your hand size. Controls are fully ambidextrous, including the slide stop and magazine release, so there are no compromises for left-handed users. The striker-fired trigger runs a duty-weight pull with a clean enough break for practical accuracy, and the flat-faced geometry provides a consistent point of contact shot to shot.
This specific bundle is configured with five 10-round magazines, which makes it one of the better-stocked training packages you'll find on a factory pistol. The MIL-STD-1913 accessory rail up front takes a weapon light without any adapters, and the FN soft case included in the package keeps everything organized. If you're building a suppressor-ready, optics-ready platform without spending extra money piecing together aftermarket components, the 509M Midsize Tactical is one of the few guns that arrives genuinely ready to go.
It's one of the better factory suppressor hosts in the 9mm category. The 4.5" barrel is threaded 1/2×28, which is the most common thread pattern for 9mm suppressors, so it pairs with most cans on the market without an adapter. The suppressor-height night sights are already set up to remain visible above a mounted suppressor, and the FN 509 platform has a strong reputation for reliable function both suppressed and unsuppressed.
The factory slide is milled and ready for FN's Low-Profile Optics Mounting System, which comes in the box with the pistol. The kit includes plates and hardware to mount a wide range of popular micro red dots including the Trijicon RMR, Leupold DeltaPoint Pro, Holosun, Burris Fastfire, and others. You won't need to track down third-party plates or visit a machine shop.
The midsize grip frame keeps the overall height down, which is the bigger factor for IWB carry comfort. The 4.5" barrel does add some length compared to a compact carry gun, so it's more at home in an OWB, AIWB, or duty rig than deep concealment. Purpose-built holsters are available from several major manufacturers. Many people carry the 509M Tactical successfully, but it's worth trying it in your intended holster setup before committing.
Yes, this specific SKU (66-101712) is the 10-round magazine configuration. Standard FN 509 magazines in 15, 17, and 24-round capacities are compatible with this frame and can be purchased separately. The FN 509 series uses a common magazine platform across most variants, and higher-capacity magazines include grip sleeves to properly fit different frame sizes.
It's a duty-weight striker-fired trigger with a consistent pull in the 5-6 lb range and a clean enough break for practical defensive and duty work. It's not a competition trigger out of the box, but it's predictable and reliable. Aftermarket options like the Apex Tactical drop-in kit are popular with those who want a lighter, flatter-faced trigger without sacrificing the factory safety system.
No, a weapon light is not included. However, the pistol features a full-length MIL-STD-1913 Picatinny rail on the frame that accepts most standard pistol lights and laser/light combos without adapters. The threaded muzzle extends slightly past the rail, leaving clearance for most popular lights to mount without interference.
| UPC | 845737017422 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101712 |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 4.5" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Length | 12.5 |
| Number of Magazines | 5 10 rd. |
| Package Height | 3.5 |
| Package Width | 11.5 |
| Product Type | Semi-Auto Pistol |
| Safety | No |
| Shipping Weight | 4.3 |
| Sights | Suppressor-Height 3-Dot NS |
| Sights Type | Night Sights |
| Slide Description | Optic Ready/Serrated |
| Color | Black |
| Model |
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