The Tru-Dot Tritium Night Sight for H&K USP FS from Meprolight is a sight system with glowing dots that are visible under any light condition, including total darkness. When used as a complete set, the three dots align horizontally, forming an easily discernible sight-alignment. The sight can withstand stout recoil, harsh field conditions as well as solvents. This model is compatible with H&K USP full-size pistols, and includes front and rear sights with green dots.
Self Illuminated light source - no batteries or switches, always ready when you need them
Operates under all light and weather conditions
Totally integrated day/night sighting
Can be mounted directly in place of factory sights, with no modifications