This 5-inch direct drop-in ported barrel is built specifically for the FN 509 pistol and designed to work with the Apex ported slide. When the barrel is in battery, the port vents line up exactly with the cutouts in the slide, keeping the gas flow where it belongs. If your slide does not have matching port vents, do not use this barrel — the high-pressure gas will destroy the frame.
Real-world performance you can feel. The five-port design vents hot gas at the right time to push the muzzle back down. That means less muzzle rise and less felt recoil on every shot. You stay on target faster for follow-up shots, whether you’re running drills or just burning through a case of range ammo.
Built to take abuse and last. This barrel starts as a cold hammer forged blank of heat-treated stainless steel. It’s then finished with a black Melonite treatment for serious corrosion and wear resistance. The 1:10 twist rate stabilizes a wide range of bullet weights, and the recessed target crown protects the rifling from damage during handling or holster wear. Every barrel is 100% made in the USA — Phoenix, Arizona.
Drop-in fit for the Apex slide. No fitting, no gunsmithing. Install it yourself in minutes. The ports are machined to match the vent pattern on the latest Apex 5-inch 509 slides. If you have an older Apex slide or a factory slide without ports, this barrel will not work — the gas has nowhere to go and the frame will fail.
Specs at a glance:
- Caliber: 9mm
- Length: 5 inches
- Twist rate: 1:10
- Material: Cold hammer forged, heat-treated stainless steel
- Finish: Black Melonite
- Ports: 5, aligned with Apex ported slide vents
- Fitment: Direct drop-in for FN 509 with Apex ported slide
- Made in: Phoenix, AZ, USA
- Price: $250
Important safety note: A ported barrel changes the pressure dynamics of the firearm. The slide must have matching port vents. If the gas from the barrel ports hits solid metal (like a non-ported slide or a slide with misaligned vents), the pressure will blow the frame apart. This is not a hypothetical risk — it will destroy the gun and can cause injury. Only install this barrel in a slide that is designed for it.
Why buy from us. We stock bulk quantities of FN
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