FN 509 9mm Full-Size Striker-Fired Pistol, 4" Barrel, Fixed 3-Dot Sights, 17+1 Capacity
American-made in Columbia, South Carolina, this FN 509 is the standard 4.0-inch non-MRD configuration derived from FN’s XM17 Modular Handgun System submission, a program that saw more than one million test rounds during development. It is a full-size 9mm with a 17+1 capacity, front and rear cocking serrations, fixed 3-dot sights, an ambidextrous slide stop, and an integral Picatinny/M1913 accessory rail.
This is a 9mm, striker-fired, polymer-frame semi-automatic pistol manufactured by FN America. It features a 4-inch steel barrel with a recessed crown and non-threaded muzzle. The slide has robust front and rear serrations and dovetailed sight cuts holding fixed 3-dot iron sights for a durable, service-grade sight picture.
The frame provides an aggressive textured grip for confident control, while the trigger safety and ambidextrous slide stop support secure and straightforward operation. The integral Picatinny/M1913 accessory rail makes it easy to mount compatible lights or other accessories.
Capacity is 17+1, and the included steel double-stack magazine uses an orange follower and numbered witness holes for quick status checks. Origin and build are U.S.-based, with production by FN America in Columbia, South Carolina.
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: The bore is clean, and the lands and grooves show minor wear.
What’s Included
- 1x 17-round steel double-stack magazine with orange follower and numbered witness holes
- Ace Case zippered soft pistol rug
The FN 509’s lineage traces to FN’s XM17 MHS submission, bringing a tested design into a civilian-legal, duty-ready package. This standard non-MRD 4.0-inch setup stays true to a proven formula, pairing a clean, recessed-crown steel barrel with a no-nonsense fixed 3-dot sight system.
Controls are intuitive and durable, including an ambidextrous slide stop and a trigger safety. The aggressive grip texture locks in the shooting hand, and the integral Picatinny/M1913 rail supports common duty and defensive accessories.
The slide’s front and rear cocking serrations aid manipulation in varied conditions, while the dovetailed front and rear sights provide a solid, serviceable sight picture. The 17+1 capacity and included steel magazine with orange follower and numbered witness holes make load verification fast and straightforward.
Manufactured by FN America in Columbia, South Carolina, this full-size 509 brings U.S.-built quality and a development pedigree informed by extensive endurance testing.