I have a Ruger Frontier, and I never could find a EER/pistol variable scope that would work well on this rifle. Consequently, I stuck with the Leupold FXII 2.5x IER/scout scope. I have no quarrel with it, but I still wish I had the option of reaching out to 4x-5x.
I did contact Leupold's custom shop and they indicated that they would take their 1.5x-5x/20 pistol scope and set it up for IER use. As soon as I save some pennies, I may give that a try.