See All Nite Pistol Sight &ndash; Tritium Pistol Open Sight for FN Models FNX & FNS Replaces the rear dovetail sight on all FN models FNX & FNS One-piece, Tritium lit open sight that can be attached to most popular pistols 100% USA Made The crosshair can be easily seen by those who have limited eyesight 100 Yard Range