Didn't see this posted. http://soldiersystems.net/2015/09/3...h-enhanced-combat-optical-sights-plus-goings/ Seems the operational temps were fudged a little. The zero drifted as much as 4MOA at 122 degrees Fahrenheit. I know some of you guys patrol in areas that get stupid hot. I'm not bashing the company. Never owned an EOTech, just something I saw posted on another forum. I thought I'd be in the wrong not to share here were we use rifles for more than just knocking down steel.