This Apex 9mm Threaded Barrel is designed specifically for the FN 509 model pistols with a factory 4 inches 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 inches 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.

Features:

Direct replacement of factory 4 inches barrel (no fitting required)
Improves accuracy
Use the included light recoil spring assembly when shooting this barrel with a compensator
Includes (1) thread protector with O-Ring (installed), (1) light recoil spring assembly

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