Well, the one now on my AirWolf was on my Wildcat so I've kinda been through the scope swapping. Last night I had a chance to check zero and low and behold it was still dead on. I noticed I was around 160 bar so I think this weekend I'll run this thing over the crony and see what the spread is. For the person who said return it, I don't disagree and AOA is just one hour North of me. The fact that is stayed zeroed for the first time means I need to explore this a little further. If the Wildcat wasn't so fun I would have unloaded it a long time ago.