First, an adjustable Eradicator sight with Tritium posts. The front tritium worked fine, but I wanted a "finer" aiming point. I tried a cheap scope
with a light kit made from a micro-maglight and a little red led purchased at a hobby shop. This worked ok, but the Super D scope was the answer.
The Super D
light scope. 
NO MAGNIFICATION or LENS, these fog up under hunting conditions.
IT provides for range adjustability, ultra-fine, switchable, multiple color aiming point with variable brightness, rear tritium "rifle type sight"....NO PEEP!
squirrel killing pin point accuracy at 20 yards.
Yes, it tasted like chicken.