Go to Harbor freight and buy a 79 cent double level and break it carefully. Retrieve the two bubble level vials and add one to the rifles scope. Got a cheap set of rings? Just saw the clamps off one ring and epoxy the level to it, then tighten that onto some free space on your scope tube.
What a great idea, JR !!! Thanks for the tip. So far I've not found a commerciallyavailable, reasonably priced gun or scope level worth salt. Been wondering what todo with those worthless rings I tossed aside.