The Advantage Tactical Sight (ATS) and the Dark Diamond Sight (DDS) on handguns and long guns are for speed of acquisition and precision shooting, as well as for those with older eyes and new shooters needing a quicker learning curve. The ATS and DDS are based on simple human brain responsive geometric principles and can be customized to accommodate an individual's color perceptions. The ATS is the only technically fixed sight that may be adjusted for wind-age and elevation. Our Firefly night sight upgrade (standard on the DDS) is available for those that require sighting in darkness. (less)