Chinoook Tactical Holographic Green / Red Dot Sight Scope w/ Rail Mount & 1" Rail Riser 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.