HD40 1×40 Red & Green Dot Sight. Lightweight CNC 6061-T6 aluminum red dot optic, weighing only 212g, built with 40mm wide objective lens for ultra-wide unlimited field of view. 1x non-magnification design delivers fast target capture, dual red & green illuminated dot with adjustable brightness to fit all light environments. Precise windage & elevation click adjustment with lock screws, integrated 20mm Picatinny base maintains zero after repeated disassembly.