Vortex Optics Sparc II Red Dot Sight - 2 MOA Dot The highly compact, daylight bright Sparc II is packed with performance features and lends itself to a variety of platforms. A modular three piece base offers four seperate mounting heights for user and weapon specific customization. A high base and shim plate offer absolute and lower 1/3 co-witness mounting heights. A low base provides options for handguns or shotguns. Fully multi-coated lenses offer a clear field of view and the unit is parallax free with unlimited eye relief. Elevation and windage turrets adjust the point of impact up and down or left and right. Machined from aircraft-grade aluminum, the one piece body is rugged and lightweight providing shockproof performance withstanding recoil and impact. O-ring seals and nitrogen purging ensure the unit is water and fogproof in the field. Rear facing power controls with only two buttons offer simplicity in use and adjustment of the 10 brightness levels available.