In addition to being reliable and affordable, the Freedom Ordance FX-9 Semi-Automatic Pistol was designed to be completely modular. Outfit it with any Freedom Ordnance barrel length and customize it with a nearly endless amount of AR-15 accessories. Also, you can create just about any configuration you need for your next mission. The FX-9 is machined from billet material, anodized type III aluminum components. Steel components are full hard nitride and black nitrided including the barrel, bolt, ejector, last round hold open, feed ramp and extractor for extended wear properties and corrosion resistance. The buffer tube that comes on the pistol is proprietary to the KAK Shockwave Blade brace. All FX-9 models lower receivers are threaded to receive mil-spec buffer tubes.