FN 509 Midsize Tactical 9mm 4.5" Threaded Barrel 15+1 FDE

The FN 509 Midsize Tactical bridges the gap between compact carry pistols and full-size duty weapons, delivering professional-grade performance in a versatile platform. This optics-ready pistol combines FN's military heritage with modern tactical features demanded by law enforcement and competitive shooters.

What Makes This Different

Unlike standard striker-fired pistols, the FN 509 Midsize Tactical features a factory-threaded barrel and low-profile optics cut machined directly into the slide. The ambidextrous controls and interchangeable backstraps accommodate different hand sizes without compromising the grip angle that made FN pistols favorites among military units. The flat dark earth finish provides corrosion resistance superior to standard Cerakote applications.

Key Features

• 4.5-inch cold hammer-forged threaded barrel (1/2x28 TPI) ready for suppressors
• Optics-ready slide cut accepts popular red dot sights without adapter plates
• Dual magazine capacity: 15-round flush-fit and 24-round extended magazines included
• MIL-STD-1913 Picatinny rail accommodates lights and laser devices
• Ambidextrous slide stop and magazine release for left-handed shooters
• No manual safety design eliminates training complications under stress
• Flat Dark Earth polymer frame with aggressive texturing for secure grip

The 509 Midsize Tactical excels in multiple roles from duty carry to competitive shooting. The 4.5-inch barrel length provides excellent ballistic performance while maintaining manageable size for concealed carry. Weather-sealed construction and corrosion-resistant finish handle harsh environmental conditions that disable lesser firearms. The trigger system delivers consistent 5.5-6.5 pound pull weight with minimal overtravel.

Technical Specs

• Caliber: 9mm Luger
• Barrel Length: 4.5 inches, threaded 1/2x28 TPI
• Overall Length: 7.4 inches
• Height: 5.5 inches
• Width: 1.35 inches
• Weight: 27.9 ounces (unloaded)
• Frame: Flat Dark Earth polymer with steel chassis
• Slide: FDE stainless steel with optics cut
• Magazines: 15-round and 24-round capacity
• Country of Origin: USA

FN's reputation for manufacturing military contract weapons translates directly to civilian markets through proven designs like the 509 series. The Midsize Tactical variant addresses specific needs that standard models cannot meet. Professional users recognize the value of factory-integrated features over aftermarket modifications.