How can you show off if you have that black and blue ring around your eye. Seriously, the cool thing about the 8th turn is that the barrel nut has 8 notches. If you use a torque wrench with your barrel nut wrench, you can use the notches and a index mark on the barrel(and or the action if you dont have a torque wrench) and make minor headspace adjustments using the notches to gauge the rotation allowing you to have an idea how much you have changed the headspace. Half the distance between the notches is .0031 linier movement. Center to center being .0062.