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. A third choice is to use this sight with no eye disk installed, for quick sighting in dark woods or dark days. Both large and small eye disks are included (small disk shown). 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 and #TAP-8-32-T 8-32 taper tap.

Shown with the 1/2" aperture installed. Replacement apertures are available at extra cost.
Re-order large 5/8" disk with smaller .040" aperture, #RS-57-DISK-2S
Re-order small 1/2" disk, with larger .093" aperture, #RS-57-DISK-2L
Disks have special 7/32-40 thread to fit Lyman and some other sights.

The RS-57-SML sight shown installed on a Thompson Center Hawken rifle. Rifle not included.