Poly Tech XQY-2 5.56 mm bore sight. (for .22 or .223 caliber) For the gunsmith or the serious hobbyist. Useful for the initial sighting in of scopes on rifles, sub machine guns and light machine guns. Magnification 5.3X. Field of view 6 degrees. Exit pupil 15.7 mm. Value of object distance can be selected for 50 meters, 100 meters or infinity.