Top right is five round groups chasing around with the rear sight. I went two more clicks down from the group nearest the center and saved a couple bullets rather than prove that the sight actually moved. The group at 6 o'clock is from forgetting which way you turn the front sight to move the group. DUR.
Big center target is rezeroing the scope.
Top left is a six round group taken after removing the scope and putting it back on.
Ammo used was Federal XM855 ball at 25m.