I have had all my failures with brand new Elcans in the past two years. Every time they broke right out of the box, they always internally fogged up in the slightest of bad weather, they didn't hold a zero worth a damn, and they are huge and heavy, and the eye relief sucks, especially for what they are. ACOG's are far superior for this type of application. We ditched every last MGO and all the gunners much prefer the CCO's, even the ones who were dead set against using them instead saying they wanted irons. When forced to just try them out they ended up loving them and every one now uses them. Again, MGO's are trash. I've had them fail on me in Fort Drum in the Winter, Fort Polk in the summer, Camp Atterbury in the winter, and Afghanistan in the summer.