Aim operator edition - AIM Sports Inc Dual Illuminated Red Dot Sight

Tried this red dot on a flattop AR, it mounted securely, is light, looks great and has bright reticles. The problem is it just won't hold zero. After zeroing it (using the locking hex key) it moved around 10" off center after just sitting on the rifle for a few days. RE zeroed and it kept wandering. Seems to be something to do with the springloaded clamshell design, unlike a monotube style red dot theres alot of room for movement of the upper half of the sight. Will be putting this on a flat top 22 pistol I rarely shoot instead of sending it back, its a shame it didnt work out for my AR, even though I don't think the AR recoil is strong enough to be knocking it off zero.