This blued sight, with two eye disks, is easily installed on Thompson Center, Lyman Deerstalker, Lyman Trade Rifle, and similar Hawken rifles. Two mounting screws included. Features 1/4 minute micrometer click adjustments for elevation and windage, quick release slide. Small 5/8" diameter knurled disk is drilled .040". Large 1/2" diameter knurled disk is drilled with a .092" aperture for large field of view and quick target acquisition. Made in the U.S.A. by Lyman, this sight is a favorite of target shooters. It may require drilling and tapping an 8-32 hole. Use our tap drill #DRILL-29
8-32 taper tap.
Shown with the 5/8" aperture installed. Additional apertures are available at extra cost.