No, It's just that superimposing a circle over a bullseye is not quite as precise as putting a crosshair on it. Takes a bit of getting used to after looking at crosshair reticles forever, but a good scope nonetheless. The scope seems to be a variation of the Buckmaster series, which I also have a couple of, so you might say I'm a big Nikon fan. My CS is on a bolt gun, but I wouldn't hesitate to mount it on one of my ARs either. I'm liking my ARs more all the time, mainly for the quick follow-up shot.