105-072
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What It Does
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.