The Meprolight Tru-Dot Night Sights provide combat-proven self-illuminated targeting capability for HK USP Compact pistols in 9mm and .40 caliber. These tritium-powered sights deliver dramatically increased hit probability on stationary or moving targets under low-light conditions.Meprolight Tru-Dot Fixed Set Night SightsDesigned specifically for HK USP Compact 9mm/.40 calGreen and orange tritium dots for enhanced visibilitySelf-illuminated - no batteries or switches requiredCombat-proven performance trusted by leading firearm manufacturersHighly durable structure for reliable operationPerfect for daylight low-light and nighttime conditionsThese replacement sights mount directly with minor modifications and are the first choice of leading firearm manufacturers for upgrading standard weapon sights to always-ready tritium illumination.