The HiViz FX-9 interchangeable fiber optic front sight fits FN FNS-9 and FNX-9 pistols with a 0.213-inch blade height. It does not fit FN FNP models. The all-steel sight includes six interchangeable 0.050-inch LitePipes: three green, two red and one white. A LitePipe-changing key and carrying case are included. Its factory-height design allows use with the original rear sight. Gunsmith installation is recommended.
The HiViz FX-9 is a replacement fiber optic front pistol sight designed for FN FNS-9 and FNX-9 pistols. Its steel construction and interchangeable LitePipe system provide a bright front sight while retaining the original rear sight.
The FX-9 fits FN FNS-9 and FNX-9 pistols requiring a 0.213-inch front sight blade. It does not fit FN FNP pistols. The FX-9 should not be confused with the HiViz FX-40 front sight, which is designed for FNS-40 and FNX-40 pistols and has a different blade height.
The FX-9 includes six replaceable 0.050-inch diameter LitePipes: three green, two red and one white. The included key allows the shooter to change LitePipes, and a carrying case is supplied for the additional inserts.
| Manufacturer | HiViz |
| Model | FX-9 |
| Sight Position | Front |
| Compatible Pistols | FN FNS-9, FNX-9 |
| Not Compatible With | FN FNP models |
| Blade Height | 0.213 inch |
| LitePipe Diameter | 0.050 inch |
| LitePipes Included | 3 green, 2 red, 1 white |
| Construction | Steel |
| Mounting | Dovetail |
| Additional Accessories | LitePipe-changing key and carrying case |
| UPC | 613485588781 |
The FX-9 uses a dovetail mounting system. Some fitting may be necessary because the sight base is manufactured slightly oversized to accommodate dimensional variations. Gunsmith installation is recommended. When using a sight pusher, apply pressure to the dovetail base rather than the sight blade to avoid damage.