On the Appleseed lines recently, I’ve seen many owners of the Design Contest Winner, the Collector’s Edition II, and the M1 Carbine model who don’t know how to adjust their rear sights. The 10/22 owner’s manual is no help – it only covers adjustment of the blade sight on the standard carbines and rifles. Ruger should add a page to the manual for these models.
The 10/22s with the peep sight use the Mini-14 rear sight. It is adjustable for both windage and elevation. Here’s how:
Windage: The rear aperture is held in place by two set screws. Using a 5/64 hex key, loosen the screw on the side where want the sight to move. Then, tighten the screw on the other side until the aperture is held tight again. There are no clicks and partial turns are ok. One full turn of the screw equals about 5 minutes of angle (5 MOA) or 5 inches at 100 yards. Remember, you want to move the rear sight in the same direction that you want your point of impact to move.
Elevation: Loosen one of the windage screws – only one. This allows the rear aperture post to turn freely. Then turn the rear aperture post by half-turns. To raise the point of impact, turn it counter-clockwise. To lower the point of impact, turn it clockwise. One full turn of the post equals about 1.25 MOA. Then tighten the windage screw that you loosened.
It would sure help if Ruger put this information in the box. But now you have it.