FN 509 Midsize Tactical Flat Dark Earth 9mm 4″ Barrel 10-Rounds w/ Holosun 407C

FN 509 Midsize Tactical Features

Outfitted with an optic-ready slide and factory-installed Holosun 407C, this FN 509 variant allows for rapid target acquisition in a wide range of lighting conditions. The threaded barrel (1/2×28) offers suppressor compatibility or use with compensators, while the integrated recoil-reducing design supports controlled, accurate follow-up shots. Its flat dark earth polymer frame houses FN’s precision-built fire control group with a trigger safety system, enhancing reliability and operational safety without the need for a manual safety.

Fully ambidextrous controls—including slide stop and magazine release—ensure seamless manipulation for both left- and right-handed users. Interchangeable backstraps help customize the grip profile to individual hand sizes and preferences. Internally, FN’s polished feed ramp and enhanced chamber geometry support smooth cycling with a wide variety of 9mm loads, making the 509 Midsize Tactical a dependable and rugged choice for carry, training, or tactical deployment.

FN 509 Midsize Tactical Specifications

• Manufacturer: FN
• Model: 509 Midsize Tactical
• Caliber: 9mm
• Action: Striker Fired
• Barrel Length: 4.5″
• Capacity: 10+1
• Magazine Count: 2
• Frame Finish: Flat Dark Earth
• Frame Material: Polymer
• Slide Finish: Flat Dark Earth
• Slide Material: Steel
• Sights: Holosun 407C
• Sight Type: Red Dot (Optic Only)
• Safety: Trigger Safety
• Optics Ready Cut: Yes
• Thread Pattern: 1/2×28
• Special Feature: Threaded Barrel
• Overall Length: 7.9″
• Grip: Flat Dark Earth Polymer
• Controls: Fully Ambidextrous
• Accessories: Interchangeable Backstraps
• Case: FN Soft Case