OK, have to interject my two cents here. Both eyes open is for close combat with either a rifle or pistol, it relates to situational awareness about what is going on around you . When shooting a rifle at long range I've found that closing one eye so you can completely focus on either the front site or making sure that the parallax an focus of a scoped shot are correct. Having both eyes open when shooting a scope is counterproductive since your brain is trying to figure out which image it is receiving to believe. Both eyes close range combat, one eye otherwise.I'm new to LRH recently I was listening to a podcast, and it was mentioned that when shooting have both eyes open. So wanting some input on what is the best way to shooting is it with one eye closed or with both eyes open?