The React H5 features patented React Technology in its 5 horizontally mounted fiber optic pins. This sight offers extreme accuracy up to 60 yards. REACT TECHNOLOGY Five .019 horizontal-pin sight featuring the innovative React Technology INCREASED STABILITY Reduces vibration while maintaining light-weight strength with Ballistix CoPolymer System ENHANCED VISIBILITY Adjust brightness to suit any shooting condition with the rheostat light INNOVATIVE DESIGN Make easy corrections with advanced tool-less micro-click windage and elevation adjustments INCREASED ACCURACY Strengthen accuracy over longer distances with dual-axis adjustment