Mine had to have the sight bottomed out w/a T/C 2X But not w/a Japanese made Nikon Monarch 2X if I remember right. I like the older Nikon's more than the present offering. Still looking for a used one to replace the one I sold. The new models seem to have a larger ocular housing. Friend just bought one for his Hunter but we haven't mounted it yet. I also have a Bushnell 2-6X Firefly. Great optic but it narrows the field of view.