Trijicon AC11011 ACOG 4×32 RCO (Rifle Combat Optic) with Modular Anti-Reflection Device, dual-illuminated by tritium and fiber optics so the reticle glows without batteries; tritium lights the aiming point in the dark while the fiber optic self-adjusts brightness in daylight. Reticle is ranged to 800 meters, built to USMC specification, and waterproof to 100 meters. Fixed-power design with minimal moving parts for a rugged, low-maintenance sight.