Trijicon, HD Night Sights, Fits H&K USP Compact, Yellow Front, 3 Dot Green Tritium. Instantly Visible Sight Picture In No-Light Or Low-Light Situations. Increased Daylight Dot Visibility. Enhanced Protection From Heavy Recoil And Harsh Cleaning Solvents. There’s a reason so many Trijicon(R) night sights are trusted by local, state and federal law enforcement agencies, as well as the most discerning pistol sports shooters on the planet: they’re designed for faster target acquisition in any lighting situation, as well as designed to take on abuse and still operate with precision. Upgrade your iron sights with proven, superior aiming solution technology. 3 Dot Green Tritium.