Looking for some glass to top a .50 interested in a leopold mark 4 with a bors system. Anyone out there have experience with this? Is it just a fancy ballistics computer? I won't use it for anything but long range paper punching on the .50 but I would like to try it on my AR's for hunting, can I switch it off to my other scopes? I like the concept just want to drop the extra $ on it if its not worth it.