FN 509 Midsize
FN Herstal · Pistol · In Production · 2020
Also known as: FN 509 MS
Overview
The FN 509 Midsize is a striker-fired, short-recoil-operated semi-automatic pistol chambered in 9x19mm Parabellum. It pairs a compact-length 4.0-inch cold hammer-forged stainless steel barrel and 15-round magazine with the full-size grip ergonomics of the FN 509 family, splitting the difference between the standard 509 and the subcompact 509 Compact. It features fully ambidextrous controls, interchangeable backstraps, a polymer frame with replaceable steel rails, and no manual safety.
Specifications
| Weight (empty) | 751 g (26.5 oz) |
| Overall Length | 188 mm (7.40") |
| Barrel Length | 102 mm (4.02") |
| Height | 132 mm (5.20") |
| Width | 34 mm (1.34") |
| Sight Radius | 147 mm (5.79") |
| Action Type | Short Recoil |
| Firing Mechanism | Striker Fired |
| Trigger Type | Single Stage |
| Trigger Pull | 29 N (6.5 lbf) |
| Magazine Capacity | 15 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 360 m/s (1181 fps) |
| Muzzle Energy | 481 J (355 ft·lbf) |
| Effective Range | 50 m (55 yd) |
| Maximum Range | 1800 m (1968 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 254 mm (10.00") |
| Frame Material | Polymer |
| Slide Material | Stainless Steel |
| Barrel Material | Stainless Steel |
| Finish | Black |
Calibers
- 9x19mm Parabellum · primary · 9mm NATO — also known as 9mm Luger, 9mm NATO, 9x19mm
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Striker Block Safety, Trigger Safety, No Manual Safety
- Features: Fully Ambidextrous Controls, Reversible Magazine Release, Interchangeable Backstraps, Accessory Rail, Cold Hammer Forged Barrel, Loaded Chamber Indicator, Flat Faced Trigger
Variants
- FN 509 Midsize MRD - Optics Ready
- FN 509 Midsize Tactical - Threaded Barrel
Base model
Production
Production years: 2020-present
Part of the FN 509 pistol line manufactured at FN America in Columbia, South Carolina
Origin
Country of origin: United States
Notes
Positioned between the full-size FN 509 and the FN 509 Compact; accepts full-size 509 magazines. Also offered with a factory optics-ready slide cut (509 Midsize MRD).
Background
The 509 line grew out of FN's entry in the U.S. Army's Modular Handgun System trial; the Midsize carries the winning ergonomics into a carry-friendly barrel-and-slide length while keeping the full-size 15-round grip.