Item #:
845737011611
UPC: #:
845737011611
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FN 509 Midsize Tactical 9mm 4.5" Barrel 10+1 FDE Optics Ready

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The FN 509 Midsize Tactical delivers enhanced versatility for tactical applications with its optics-ready slide and threaded barrel configuration. This striker-fired pistol combines FN's proven reliability with modern features that adapt to multiple mission requirements.

What Makes This Different

The 509 Midsize Tactical bridges the gap between compact carry and full-size duty pistols with its 4.5-inch threaded barrel and mid-frame dimensions. Unlike standard variants, this model features factory optics cuts machined directly into the slide, eliminating the need for aftermarket modifications. The combination of target crown and threaded muzzle provides both precision shooting capability and suppressor compatibility straight from the factory.

Key Features

  • Optics-ready slide with factory-machined cuts for popular red dot sights
  • 4.5-inch cold hammer-forged barrel with target crown and 1/2x28 threading
  • Flat Dark Earth Armornite finish on polymer frame and steel slide
  • Ambidextrous slide stop levers and magazine release controls
  • MIL-STD-1913 Picatinny rail for tactical accessories
  • Low-profile, snag-free slide serrations front and rear
  • 10+1 capacity with flush-fitting magazine
The 509MT performs consistently across temperature extremes and adverse conditions, meeting FN's military contract standards for reliability. The 4.5-inch barrel length optimizes velocity for defensive ammunition while maintaining manageable overall dimensions for concealed carry. Tactical users appreciate the suppressor-ready threading and rail system for lights or lasers, while competitive shooters benefit from the optics compatibility and target-grade barrel crown.

Technical Specs

  • Caliber: 9mm Luger
  • Barrel Length: 4.5 inches, threaded 1/2x28
  • Overall Length: 7.4 inches
  • Height: 5.5 inches
  • Width: 1.35 inches
  • Weight: 27.1 ounces (unloaded)
  • Capacity: 10+1 rounds
  • Frame: Flat Dark Earth polymer with textured grip panels
  • Slide: Steel with Flat Dark Earth Armornite coating
  • Trigger: Striker-fired with approximately 5.5-7.0 lb pull
  • Sights: Three-dot configuration, optics-ready cuts
  • Country of Origin: USA
The FN 509 Midsize Tactical represents a mature platform refined through military and law enforcement feedback. Its factory optics compatibility and suppressor-ready configuration eliminate common modification costs while maintaining FN's reputation for consistent performance.