Chinoook Tactical Holographic Red / Green Reflex Scope sight combo 4 Reticles Windage and elevation adjustable with locking mechanism (tools included) Tubeless design with 33mm reflex lens aperture provides a wide field of view, suitable for normal and rapid-firing shooting of moving targets. Red and green reticles with four patterns Adjustable reticle brightness Integrated mount for standard 20mm rails.