https://www.youtube.com/watch?v=4rh1jPOCCA0&list=PLH-z2B3LX1bmDrRuNVrh4AUEanb5jAmMT&index=8 https://www.primaryarms.com/Primary-Arms-4-14X44-FFP-Scope-with-308-p/pa4-14xffp308.htm This optic is set for M80 at 2790 fps the average fps out of a M1A/M14 AR10's/AR15 using .223 also great with...