Dark mode is

Apex Tactical Specialties 9mm Threaded Barrel for FN 509 - 4"


Out of stock

Apex Tactical 9mm Threaded Barrel for FN 509 - 4"


This Apex 9mm Threaded Barrel is designed specifically for the FN 509 model pistols with a factory 4.00" barrel. This includes the FN 509 Midsize. The heat treated stainless steel barrel has a black Melonite finish with contrasting stainless flutes. The barrel features a 1:10” twist rate that is designed to increase accuracy performance. The thread pattern is 1/2-28 and a thread protector is included. This barrel is a true drop-in and requires no fitting.

Expected Results

  • Direct replacement of factory 4.00" barrel (no fitting required)
  • Improves accuracy
  • Use the included Light Recoil Spring Assembly when shooting this barrel with a compensator

Applicable To What Gun(s)

  • Works in all FN 509 9mm models with a factory 4.00" non-threaded barrel, including the FN 509 Midsize.

In The Package

  • 1 ea. Apex 9mm Threaded Barrel - 4.00"
  • 1 ea. Thread Protector w/ O-Ring (installed)
  • 1 ea. Light Recoil Spring Assembly

Installation Resources

  • This barrel is a true drop-in barrel and requires no fitting.
More Information
SKU 105-072
Product Type Barrel
Manufacturer Apex Tactical Specialties
Barrel Length 4"
Caliber 9mm