The ATN PS22 is an attachment for the Daytime Riflescope with 1x-6x (2.5x-4x are optimal) magnification that is converting the Scope into a high-quality, very accurate Night Vision Weapon Sight. The ATN PS22 mounts in front of a Daytime Scope. Re-zeroing of the Scope is not required. The ATN PS22 comes standard with 7/8" Weaver Mount. There is also Adapter for ARMS quick release mount. Optional Ring Adapters allows to mount the unit onto the objective of the Daytime Scope (25...62mm diameter).