22X33 Reflex Sight with Green Laser 4 Reticles for 20mm Rail, Red/Green Dot Opti. Water, fog, and shock proof for reliable performance in all weather conditions. Constructed from aerospace grade aluminum alloy for durability. Windage and elevation adjustable with included tools for precise zeroing. Unlimited eye-relief and corrected parallax for versatile use. 33mm reflex lens with tubeless design offers a wide 15.8m field of view at 100m. Compatible with 20mm (0.8) rails and features four illuminated red/green reticle patterns.