The FN 509M MRD delivers optics-ready performance in a mid-size platform that bridges the gap between compact carry and full-size duty pistols. This striker-fired 9mm combines FN's military-proven reliability with modern features demanded by serious shooters.
What Makes This Different
The 509M MRD features FN's Low-Profile Optics Mounting System that accepts popular red dot sights without adapter plates. The recessed crown barrel design protects the muzzle while maintaining accuracy potential. Unlike basic polymer pistols, the 509M includes ambidextrous controls and a genuine Picatinny rail system rated for tactical accessories.
Key Features
- Optics-ready slide with pre-installed mounting system for direct red dot attachment
- 4-inch cold hammer-forged barrel with recessed target crown
- 10+1 capacity with included magazine
- Ambidextrous slide stop levers and magazine release
- MIL-STD-1913 Picatinny rail for lights and lasers
- Serrated stainless steel slide with matte black finish
- Low-profile, snag-free sights with luminous inserts
The 509M MRD demonstrates consistent accuracy with quality ammunition, typically grouping under 3 inches at 25 yards. The trigger breaks cleanly with minimal overtravel, supporting precision shooting in competitive and defensive applications. Weather-resistant construction and corrosion-resistant finishes ensure reliable function across temperature and humidity ranges.
Technical Specs
- Caliber: 9mm Luger
- Capacity: 10+1 rounds
- Barrel Length: 4.0 inches
- Overall Length: 7.4 inches
- Height: 5.5 inches
- Width: 1.35 inches
- Weight: 26.9 oz (unloaded)
- Frame: Polymer with integrated Picatinny rail
- Slide: Stainless steel with matte black finish
- Sights: 3-dot luminous front and rear
- Safety: Trigger safety, firing pin safety, drop safety
- Country of Origin: USA
The FN 509M MRD represents proven engineering from a manufacturer with decades of military and law enforcement contracts. The optics-ready design eliminates gunsmithing costs while the ambidextrous controls accommodate all shooters without modification.