*Aerospace-grade aluminum alloy construction for long-lasting reliability, recoil impact certified up to 1000 grams*Red Green Dot equipped with an integrated Picatinny mounting base. Fits standard 20mm Picatinny or Weaver, change color by turning the large hairspring next to it, and changing the selector knob pattern*parallax corrected and unlimited eye relief.interchanging reticle patterns with red and green holograph options (plus adjustable brightness) provide a total of 8 different sights and can choose the appropriate aiming mode for different scenes and even different objects.