The ATN PS22-3A System is an attachment for a Daytime Riflescopes with 1x-6x (2.5x-4x are optimal) magnification that converting scope into a high quality, very accurate Night Vision Weapon Sight. The ATN PS22-3A mounts in front of a daytime scope. Re-zeroing of the scope is not required. The ATN PS22-3A comes standard with 7/8¥Ö_ weaver mount. There is also Adapter for ARMS quick release mount and optional Ring Adapters allows to mount unit onto the objective of the Day Scope (25...62mm diameter). The IR Illuminator can be mounted onto the optional Picatinny Rail. The PS-22 utilizes a 2nd Gen.+ or 3rd Gen. Image Intensifier Tube. This ingenious setup allows the shooter to go from day to night in less then 30 seconds without tools, without changes in eye relief and remain zeroed all around the clock. The ATN PS22-3A is a complex optical-electronic system. The Night Vision Device contains an Image Intensifier Tube assembly with an integrated high voltage power source and the three volt battery housing.