Description

The FN 509 Tactical is a striker-fired, semi-automatic 9 mm pistol developed from FN Herstal’s FN 509 series, which originated from its U.S. Army Modular Handgun Trials submission. Designed for tactical, defensive, and duty roles, this pistol combines a threaded barrel, optics-ready slide, and enhanced ergonomics with extended magazine capacity and ambidextrous controls. It’s built to accept red-dot sights and accessories without requiring slide milling.

---

Specifications

General

• Model: FN 509 Tactical pistol
• Type: Semi-automatic striker-fired handgun
• Caliber: 9×19 mm Parabellum
• Action: Double-action striker-fired autoloader
• Frame: Polymer with replaceable steel frame/slide rails
• Weight: ~27.9 oz

Barrel & Sights

• Barrel Length: ~4.5″ (cold hammer-forged stainless steel)
• Barrel Threads: ½″-28 TPI (for suppressor/compensator) with O-ring retention
• Sights: Suppressor-height sights; co-witness with optics †
• Optics Ready: FN Low Profile Optics Mounting System™ accepts many miniature red-dot optics without additional slide milling

Controls & Ergonomics

• Ambidextrous Controls: Slide stop lever and magazine release operate from either side
• Grip: Enhanced textured grip with interchangeable backstraps
• Accessory Rail: MIL-STD-1913 “Picatinny” rail for lights/lasers

Capacity

• Standard Magazines: One 17-round and one extended 24-round magazine included
• Alternate Configurations: Some states/retailers offer 10rds magazines

Dimensions

• Overall Length: ~7.9″
• Height: ~5.75″
• Width: ~1.35″
• Twist Rate: ~1:10″ RH

Included With Purchase

• Two magazines (17- and 24-round standard/compliant variations)
• Interchangeable backstraps
• Optics mounting plates
• Soft pistol case and owner’s manual

---

Features & Characteristics

Optics & Accessory Ready

• Optics-Ready Slide: Patented Low Profile Optics Mounting System lets you mount many micro red dot sights without altering the slide.
• Suppressor-Height Sights: Co-witness with most optics and work well with threaded barrels.
• MIL-STD-1913 Rail: Allows lights/lasers for tactical or defensive setups.

Ergonomics & Controls

• Ambidextrous Controls: Fully accessible slide stop and magazine release for right/left-handed use.
• Adjustable Grip Fit: Interchangeable backstraps help tailor grip size.

Capacity & Carry

• Extended Capacity: Standard extended magazines maximize carry load without undue length increase.
• Accessory-Friendly: Threaded barrel and optics system support suppressors and red dot setups.