The Meprolight Tru-Dot Green Tritium Adjustable Sight Set is a direct drop-in upgrade for Smith & Wesson K, L, and N frame revolvers equipped with a pinned front sight and adjustable rear — excluding DX-style and dovetail-cut models — delivering self-illuminating Swiss tritium front and rear sights with white contrast rings for fast, consistent 3-dot target acquisition in any lighting condition with no batteries required. The fully adjustable rear sight allows precise windage and elevation compensation for bullet weight, distance, and environmental conditions, while the fixed tritium front provides an always-visible green aiming reference that appears white in daylight and glows green in low-light and darkness. Drop-proof, shockproof, maintenance-free, and backed by Meprolight's 12-year tritium illumination guarantee, these sights mount directly to the factory revolver frame with no permanent modifications required. Meprolight USA Tru-Dot Green Tritium White Ring S& W K/L/N Frames Pinned Front (Non-DX Style or Dovetail) Adjustable Rear Sights 227713108