PEORIA, Ariz. – Apex Tactical Specialties, the industry leader in aftermarket performance upgrades for the FN 509 series of pistols, is pleased to announce it has opened up pre-ordering for its new complete, ready-to-fire five inch optics ready upper assembly for the FN 509.

Designed by Apex’s engineering team and manufactured at the company’s state-of-the-art Arizona manufacturing facility, the new custom longslide assembly is packed with features. The fully machined slide is optics ready with the RMR pattern cut. It’s lightened to mimic factory slide mass with both front and rear cocking serrations. Sight dovetails accept FN sights.

The slide comes fully assembled with Apex’s Heavy Duty Striker, the Apex Failure Resistant Extractor and an Apex premium hammer-forged 9mm barrel with a 1:10” twist rate. Customers can select between a standard length 5.00” barrel or a 1/2-28 threaded barrel with thread protector and captive O-ring. A yellow recoil assembly is included.

While red dot ready, the slide is shipped with either standard height XS 3-Dot night sights or suppressor height sights (black/black), depending on the customer’s preference. The slides will be available in stainless or black Melonite finish.

Features and Specifications:
– Apex 9mm Hammer-Forged Premium Barrel
– Apex Heavy Duty Striker
– Apex Failure Resistant Extractor
– RMR Pattern optic cut and cover plate
– Available with Standard Height Night Sights (XS 3-Dot) or Suppressor Height Sights (Black/Black)
– Front and Rear Cocking Serrations
– Finish Options: Stainless or Black Melonite
– MRSP: $600.00

The new 5.00” custom longslide is the latest of many Apex aftermarket upgrades for the FN 509. The following is a list of other available Apex upgrades compatible with the FN 509 line of pistols:

– Action Enhancement Kit (part# 119-125 or 119-126)
– Apex Heavy Duty Striker (part# 119-185)
– Apex Failure Resistant Extractor (part# 119-168)
– Apex 9mm Threaded Barrel for 3.70” (part# 105-075) or 4.00” (part# 105-072) models
– Apex Optic Mount for the Aimpoint® Acro P-1 optic (part# 119-109)
– Apex Optic Mount for the Shield Sights RMSc optic (part# 119-108)
– Apex Slide Maintenance Kit (part# 119-171)

For more information on parts from Apex Tactical Specialties, visit, like Apex Tactical on Facebook or follow @ApexTactical on Instagram or Twitter. Instructional videos on the installation of Apex parts are available on Apex's YouTube, Full30 and GunStreamer channels.

*FN and FN 509 are trademarks of FN America, LLC