Bolt Locking Lugs

[Parashooter]

What is the distance to move the No1 Mk III front sight blade to equal a one-inch movement at 100 yards?

Sight radius in inches / 3600" = Sight movement for 1" POI change at 100 yards. Example: 24"/3600"=0.0066"

Or, for a quick and dirty calculation, just remember one-two-three-four -

For a one-minute change,
Measure the distance between the two sights,
Multiply that by three.
Move the decimal point four places to the left.

Example: 24" x 3 = 72", move decimal = .0072".

Close enough - and no calculator needed if you can multiply by 3. (This is actually a little trigonometry, since the tangent of one minute of angle is about .000291.)