That Quigley sight is 3 or 4 hundred dollars or more depending on options, front sight inserts, bubble level that they say is a must.
And I still have to use my almost 70 year old eyes. The scopes are a fixed 3 or 6 power with a 3/4" tube. They have no internal adjustments. You jack up the back end on a ladder type mount for elevation . The front mount adjusts side to side for windage.