Price range and purpose? The old rule of thumb was to expect to spend half as much on the optic as you did on the rifle. Now days many say expect to spend as much or more on the optic. A lot will depend on what you want that optic to do. I tried a cheap scope on my AR and wound up pulling my old Leupold Vari X III 1.5-5 off my hunting rifle. Its not cheap and today's model costs almost as much as the gun.