The Trijicon ACOG TA33 Compact Rifle Scope features a ruggedized forged housing that deliver combat proven durability and reliability, specifically engineered to provide increased hit potential in all lighting conditions. The ACOG TA33 features Bindon Aiming Concept, allowing both eyes open shooting for improved situational awareness, and battery free tritium/fiber optic illumination in any lighting.FeaturesBattery free tritium/fiber optic illumination Outstanding clarity maximizes light gathering capabilities and clear field of viewRugged aluminium alloy housing creates a nearly indestructible sighting system Exact target distances and holds Combat proven durability and reliability Both eyes open shooting improves situational awareness