ZeroTech Optics Thrive 1x20mm Red Dot Sight Reflex Red Illuminated Reticle. Built on a popular footprint the Thrive HD Reflex will mount to most firearms. The Thrive HD reflex sight comes standard with a picatinny rail interface. Specifications for ZeroTech Optics Thrive 1x20mm Red Dot Sight Reflex: Manufacturer: ZeroTech Optics Color: Black Magnification: 1 - 20 x Magnification Type: Variable Objective Lens Diameter: 20 mm Reticle: Red Illuminated Package Contents: ZeroTech Optics Thrive 1x20mm Red Dot Sight Reflex ZeroTech Optics THRD22: Thrive 1x20mm Red Dot Sight Reflex Red Illuminated Reticle