Bracket mounted, the 7.62/50 Caliber 12.7 MM machine alignment boresight is used to aim, align and check the manual, optical and electronic sighting systems on a tank’s commanders weapon station. Replaces the armament being positioned, calibrates the mounting fixture. Instrument is then replaced with the armament. Power: 24x. Field of View: 1°. Focus Range: 12 ft. to infinity. Target Position Adjustment: ± .05 Mil. Shown w/ Right Angle Eyepiece.