If it is a pneumatic (Pre-compressed or pump up) type of air rifle and not a spring powered piston unit any scope that will focus down to the needed range will work. Now if it is in fact a spring powered unit you need to use a scope rated for air rifles as the reverse recoil of this type will tear a standard scope apart in short order. Example of a spring powered air rifle would be an RWS 48 (side lever) and most barrel cockers like a Beeman R1. if unsure post the make and model although most times it is possible to just search the web.