The PS-22 is a universal night sight (UNS) from ATN. It works as a front-side attachment for day scopes, to convert your regular day scope into a night vision system. It has many benefits, of which the the most obvious one is the ability to use your already sighted day scope as a night sight. It requires a use of a longer picatinny mount on your rifle that would hold both the day scope and PS-22. Included ARMS mount will allow quick release for use with PS-22. Optional ring adapter helps to attach the day scope directly to the PS-22 (though not necessary to operate the PS-22). UNS sights allow conversion from day to night system in less than 30 seconds, without special tools and without effecting a zero. Clean optics and high quality image intensifiers guarantee a clarity of the image and good resolution. Another important feature of PS-22 is it's affordability. Where military-grade PVS-22 and BNS systems are cost prohibitive for most consumers, PS-22 delivers very good alternative option. This sight is available with Gen 2 and Gen 3 image intensifiers to satisfy any night enthusiast.