Right now I have the IOR 3-18x42. I love everything about the scope except how little distance between the turrets and the magnification adjustment. Anyway I am considering getting a viper pst or a razor. I have not seen any post this year comparing the viper vs the razor. What is the biggest difference between the 2. Also could anyone compare the 2 to an IOR. I may also go with the IOR 3-18x50.