Most sights have a 1/2moa windage adjustment. Some have a second detent ball to provide 1/4moa windage.
I have seen 3 different thread pitchs for the elevation (.150"/turn, .150"/2 turns, .150"/3 turns). All of them have 25 clicks per turn. A 20" barrel has a 20.125" sight radius making the point of impact move by 1.46, .73, or .49 inches per click at 100 yards. The 16 or 14.5" barrels have a sight radius of 14.750" making the point of impact move by 1.07, .54, or .36 inches per click at 100 yards.
The standard GI moves the rear sight elevation by .150" in 1 turn. It has just over 1 turn range. The elevation knob has a flat marked 8/3 with other marks at 4,5,6,7. It has 3 clicks between 3 and 4.
The "target" rear sight moves the rear sight elevation by .150" in 2 turns. It has a range a little more than 2 turns. The knobs marked 1,2,...,10 are commonly used for these. The knob with 6/3 on the flat and marks at 4 and 5 will provide the correct point of impact at the indicated ranges with a 20" barrel. These knobs have 6 clicks between 3 and 4.
The sight on the removable carry handle also moves the rear sight elevation by .150" in 2 turns. The body of the carry handle sight is smaller and the range is only a little more than 1 turn. My removable carry handles use the knob marked 6/3 on the flat.
I have seen only one rear sight that moved by .150" in 3 turns.