FN 509D Duty MRD
The FN 509® is built on the proven architecture of the FNS™ Compact, FN made changes internally and externally to meet the rigorous performance standards of the MHS requirements and further developed the platform into the FN 509® with the help from industry experts. Over the course of development, the platform has been tested extensively for reliability, ammunition compatibility and durability – totaling more than one million rounds.
9mm
Caliber
17 Rd.
Mag. Capacity
27 oz.
Weight
1:10" RH
Twist Rate
1.35"
Width
5.56"
Height
7.4"
Overall Length
4.0"
Barrel Length
Specifications
Construction
The FN 509 Duty is a striker-fired, polymer-framed, semi-automatic 9 mm pistol built with a cold-hammer-forged steel slide and high-strength components to meet rigorous reliability and durability standards developed from FN’s military pistol trials.
Key Features
Designed for duty and defensive use, it offers ambidextrous controls, optics-ready slides (Low-Profile Optics Mounting System on Tactical/MRD variants), high-capacity magazines (up to 24 + 1), threaded barrels on Tactical models, and MIL-STD-1913 accessory rails for lights/lasers.Maintenance
Routine maintenance for the FN 509 Duty includes regular cleaning of the barrel, slide, and frame, inspection of moving parts for wear, and following the manufacturer’s recommended lubrication schedule to ensure reliable function and long service life under duty use.