In addition to being reliable and affordable, the FX-9 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. Attention to every detail is what led Freedom Ordnance to deliver a pistol caliber carbine platform that is reliable, affordable, and has a familiar set of operating controls for any AR-15 user. The FX-9 is billet machined aluminum with hardened steel QPQ nitride components for extended wear and corrosion resistance.