Click on photos to enlarge. I have no idea why Apple does a mirror image of all my photos???
There are taped holes in the black and one shot in the white from playing with the 7.62 red dot earlier.
Then...Closer to the X, there are 5 shots from the 5.56. Three shots are just to the right the X. A click here, a click there, and I think I got the 50m zero dialed on the AR. Two more shots in the X ring confirmed my adjustments, and my spotter says, "You'd better quit now." That was with Daniel Defense iron sights and Federal M855. PSA 16" upper and LRB lower. CMMG fcg.
I didn't do nearly as we'll with the red dot. Combat accurate (3-4" groups), but much wider than the rifle is capable of. I find it difficult to center a dot that far out. Inside 20m, the red dot helps with fast shots where I might not maintain a good cheek weld.