I run a piston ar and have a fixed front sight. I've been planning to get an eotech with lower 1/3 cowitness because of the front sight. But I've been thinking a troy front flip up or the new magpul pro would easily stand up to the heat. So having both sights flipped down would negate the need for the lower 1/3 right? Because I still see videos and pictures of people with flip ups running aimpoints and eotechs at lower 1/3 cowitness. So is there ANY other reason to have a lower 1/3 other than to clear iron sights?