Nikon Prostaff 3x9 on my Sidekick, as well as my 243, 270, & 3006. I got mine on-line for around $125. Wally World, Bass Pro etc. wants about 150-160. Reasonable price, lifetime gaurantee, I've found no reason to spend more $. I do have a Nikon Monarch on another rifle, but could've got 2 Prostaffs cheaper, wished I had.