"Not that anybody asked, but the NECG makes a pretty good ghost ring if you just leave off the factory aperture inserts..."
...So then there is nothing to lock the elevation adjustment of the aperture and it is free to drift...
And, with those huge metal walls on either side of the aperture, just as you pull the trigger on that little 8 point, a huge mature heavy beamed 10 pointer steps out of the brush into open sight, several yards to the left of the spindly buck you are shooting. But you did not see the big buck because of the NECG wall of metal on both sides of your "ghost ring" aperture. :x