Trijicon HD Night Sights Fits H&K USP Compact 3 Dot Green Glow with Yellow Front Outline HK108Y-600598. 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. Instantly Visible Sight Picture In No-Light Or Low-Light Situations. Increased Daylight Dot Visibility. Enhanced Protection From Heavy Recoil And Harsh Cleaning Solvents. Manufacturing defects vary by individual Brands. We will give instructions as what is to be done on a case by case basis.