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I award you no points and may god have mercy on your soul. But seriously I think your talkin the elevation? The 2 is set for 200 yrd after zeroing. From there if you want to hit a target at 300 yrd dial to 3 and so on. Each click is 1/4 " at 100 yrds dependig on your rear sight.
USGI sights: 1 click changes the impact of the bullet approx 1" @ 100m/y
National Match sights: 1 click changes the impact of the bullet approx 1/2" @ 100m/y
M14 sight is graduated in meters M1 sight in yards.
Elevation adjustment range: 0-72 clicks
Windage adjustment range: 16 clicks L or R of center index.