FN 509 Midsize Tactical 9mm — 4.5 in Threaded Barrel, Optics-Cut Slide, Suppressor-Height Sights, 24+1 Capacity
This FN 509 Midsize Tactical stands out with a 4.5 in cold hammer-forged stainless barrel threaded 1/2x28, an optics-cut slide, and suppressor-height iron sights. It comes in excellent condition with four 24-round magazines, one 15-round magazine, and FN’s Low-Profile Optics-Mounting System plates and hardware. The pistol is marked FN Columbia, SC USA and includes the factory box, FN soft case, manual, and a spare backstrap.
The slide features front and rear serrations with a matte black finish and the FN oval crest. The rear sight is mounted on the optics cover plate, while the front sight uses a white insert for a clear sight picture. A serial number plate with QR/DataMatrix is located on the dustcover underside for modern identification.
Controls include an ambidextrous slide stop and a left-side magazine release. The striker-fired action pairs with a flat-faced trigger and a trigger blade safety. The black polymer frame uses aggressive grip texture and interchangeable backstraps to tailor the fit. A MIL-STD-1913 accessory rail on the dustcover supports lights or other compatible accessories.
Capacity is 24+1 with the included extended magazines, and the package provides four FN 509-series factory steel 24-round mags plus one 15-round mag. The overall configuration delivers a ready-to-equip platform with the included optics-mounting plates and hardware.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Shows minimal handling evidence on external surfaces. Bore appearance is bright and reflective consistent with the rating above.
What’s Included
- FN factory box (original)
- FN-branded soft zip case
- FN 509 Series owner's manual
- FN Low-Profile Optics-Mounting System plates and hardware
- Factory interchangeable backstrap (spare)
- 4x 24-round FN 509-series factory steel magazines
- 1x 15-round FN 509-series factory steel magazine
The 4.5 in threaded barrel is stainless steel and cold hammer-forged, with a 1/2x28 thread pattern to support standard muzzle devices. The matte black slide is optics-cut and the cover plate is retained by two screws for secure mounting.
Suppressor-height iron sights provide a tall sight picture; the front sight uses a white insert, and the rear sight is mounted directly to the optics cover plate. The polymer frame is finished in black and includes aggressive texture and interchangeable backstraps for user fit.
The striker-fired system uses a flat-faced trigger with a trigger blade safety. Controls are well laid out with an ambidextrous slide stop and a left-side magazine release. A MIL-STD-1913 accessory rail on the dustcover enables mounting compatible accessories.
Fit and finish details include the FN oval crest on the slide, a serial number plate with QR/DataMatrix on the dustcover underside, and frame markings reading 'FN COLUMBIA, SC USA.' This example ships with a robust magazine set and FN’s optics-mounting plates and hardware for straightforward setup.