Lyman 90 MJT Receiver Target Sight - 3902050 A fully adjustable target sight for .22 caliber bolt action rifles This sight is designed to mount on Lyman and other mounting bases available for most .22 bolt action rifles. It features audible click detent, target knobs scribed in quarter minute graduations, elevation and windage arrows. Adjustable zero scales and elevation stop screw permit instantaneous return to zero. Quick release slide allows slide to be removed with a press of the release button. Large 7/8" non-glare .040 aperture. Elevation adjustable from 1.060 to 1.560 above bore centerline. Mounting bases available separately.