If I needed an optical sight, I'd only ever put some sort of prism or red dot sight on a lever action. But if it were something capable of longer distance like a 99 in 250, 308 or 300s it would be appropriate to fit a classic gloss 1" tube, 2-7x33 Bushnell Elite, Nikon Monarch, Leupold VX 1, 2 or 3 type of scope. I've seen older guys need such things, and some nice old guns tapped to accommodate their aging eyes. That always bugged me, but as I get older I can already see why they would do that. Otherwise my first choice would be aperture sights with adjustable iris.