I ran an EOTech in a Larue mount on my XCR, no problems at all. No marks on the rails, no problem keeping a zero; it fit perfect. The only thing I've heard of that doesn't work is the KAC VFG.You nailed it. Lightening cut rails and Larue don't mix... that is bad. Medcon barrel with 1/7 twist.. should have been the default. As for the trigger... no excuse. Still... a real decent first show.Get rid of the lightening cuts in the rails. It will make the uppers easier to manufacturer and give better accessory compatibility.
medium contour barrel 1/7 twist.