This sight fits perfectly on the Crossman 1377 once it is upgraded with the steel breech kit. Elevation and wind age knobs make dialing in the red dot quick and simple. In full daylight, there is a good deal of reflection from the lens coating, but under moderate and low light conditions, the red dot is very visible and crisp.
https://www.amazon.com/Crosman-Sight-Wide-Lense-0290RD/dp/B000GU86YG