No real experience with the ATN sight, but some things to consider- from the looks of it, the aiming point on the ATN is going to be visible from the sides in low light conditions since it appears to be projected onto the glass vs. appearing inside the glass, so "they" can possibly pick you out as well, and the actual optic portion doesn't look to be to sturdy either. The EO tech on the other hand, I have had some experience with, and IMO, it's one of the best reflex sights out there. Everything from the reticle to the hood over the glass portion, to the reticle "moving" if the glass gets damaged. Not to mention instead of just a red dot, it has a dot with a ring around it, and the ring has tick marks so that you can get your hold offs for various ranges. For either sight, putting it far forward should be fine as long as your upper rail is anchored and not loose. And if there is any sight blockage, shoot with both eyes open
