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The FN 509 Midsize Tactical is one of those pistols that makes you wonder why you'd buy separate guns for carry, home defense, and suppressor use. FN engineered this one to cover all three without compromise. The midsize frame sits 0.4 inches shorter in the grip than the full-size FN 509, which makes a real difference under a cover garment, while the full-size 4.5-inch slide gives you a longer sight radius and better muzzle control than you'd get from a compact. The result is a pistol that handles like a duty gun but disappears like a carry piece.
The barrel is cold hammer-forged stainless steel with a polished chamber, feed ramp, and recessed target crown, and it threads at 1/2×28 right out of the box. FN fits an O-ring thread cap to keep everything snug, so there's no thread protector rattle to deal with. The slide runs a long-wearing PVD finish and comes factory-prepared for red dots through FN's patented Low-Profile Optics Mounting System. The system uses adapter plates to accommodate a wide range of popular micro red dots without any milling or gunsmithing, and the included plates cover most of the common footprints. When you're running irons, the Trijicon 3-dot green tritium night sights stand tall enough to clear most suppressors and co-witness with a mounted optic.
The controls are fully ambidextrous, including both the slide stop and magazine release, which is still not a given on pistols at this price. The polymer frame features aggressive, well-placed grip texturing and ships with two interchangeable backstraps so you can fine-tune reach to trigger without any aftermarket parts. A MIL-STD-1913 rail runs forward of the trigger guard for lights and lasers. Every detail on this gun reflects FN's military and law enforcement DNA, from the external extractor and loaded chamber indicator to the high-endurance striker and duty-weight trigger pull of approximately 5.6 pounds.
After 1,000-plus rounds, reviewers consistently point to the same strengths: superb accuracy from the hammer-forged barrel, smooth cycling, and a light recoil impulse that's well-managed for a pistol this size. The slide serrations run front and back and are deep enough to get purchase in wet or cold conditions. The FDE finish is consistent across both the slide and polymer frame, giving the whole package a clean, purpose-built look without coming across as flashy. This is an FN, and the fit and finish reflects that. The trigger is duty-grade and functional with a clean break around 5.6 pounds, and it smooths out noticeably with round count if the factory feel isn't quite your preference out of the gate.
The 509 Midsize Tactical uses FN's patented Low-Profile Optics Mounting System, which uses interchangeable adapter plates included with the pistol to accommodate a wide variety of popular micro red dots without any gunsmithing or slide milling. The system is designed to co-witness with the suppressor-height tritium night sights, so your iron sights remain usable with an optic mounted. FN also notes the plate system is designed with future optic compatibility in mind, so you're not locked into whatever footprints existed when the pistol was made.
Yes, the barrel is threaded at 1/2×28 and ships with an O-ring retention thread cap already installed. The suppressor-height Trijicon tritium night sights are also included specifically so they'll clear most 9mm suppressors and remain visible above the can. You'll need to source a suppressor separately and handle the associated registration process, but the host pistol itself is fully ready.
The main difference is grip height and overall frame size. The Midsize grip frame is 0.4 inches shorter than the standard FN 509, which makes it more concealable while still providing a full four-finger grip for most hand sizes. Both share the same 4.5-inch threaded barrel, PVD slide finish, optics mounting system, and ambidextrous controls. The Midsize Tactical is essentially the sweet spot between the full-size Tactical and the Compact Tactical in FN's lineup.
This specific model (MPN 66-100746, UPC 845737011611) ships with two 10-round magazines. FN offers the 509 Midsize Tactical in a separate configuration (MPN 66-100745) that includes one 15-round and one 24-round magazine. The pistol itself is identical between the two versions, and it is compatible with all FN 509 series magazines.
No, this model does not have a manual thumb safety. Instead, it relies on four passive safety systems built into the action: a trigger safety, striker block, drop safety, and trigger disconnect. This is the standard configuration for duty-focused striker-fired pistols, and it's how the vast majority of law enforcement and military users run the platform.
The factory trigger is a duty-grade pull with an average break around 5.6 pounds. It's consistent and safe for carry, though some find the initial feel a bit stiff compared to competition-oriented pistols. The good news is that it smooths out with round count, and there are well-regarded aftermarket options like the Apex Tactical trigger kit that drop in without modifications and noticeably improve the break and reset for those who want a crisper feel.
| UPC | 845737011611 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-100746 |
| Action | |
| Barrel Length | 4.5" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Safety | No |
| Shipping Weight | 3.7 |
| Sights | 3-Dot Night/Suppressor Height |
| Sights Type | 3-Dot Night/Suppressor Height |
| Slide Description | Optic Cut/Serrated |
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