After a couple months of backorder, I finally go my C2 and Aimpoint Combo. I have been reading this forum for months on the 2 vs 4 MOA dot, and decided to get the 2 MOA. I notice in darkness, I see a slight star effect on one corner of the dot. I did a search and couldn't locate the answer. If I recall correctly, that can have something to do with your actual eyesight, and not necessarily the red dot? Indoors in lighting, I really don't see the one the slightly off circle.
Also, on my Aimpoint QPD mount, I installed it with no problem, but would you recommend blue loctite on the mounts screws? I have mounted without spacer I ordered, as I like the dot right on top of the post. I may change later, but it will stay this way for now. My MI Single Plan Low Mount will be going on next as the BUIS>