Originally Posted by
Outpost75
Front sight blades for both the British Pattern 14 and the US 1917 come in eleven different heights, ranging from 0.985 to 1.135 inches above the centerline of the bore in .015 increments. The "0" marked front sight would be the second lowest and should measure an even inch above bore centerline if the sight has not been filed. Changing the height of front sight by one increment of .015 inch changes the point of impact 1 mil, about 3.9 inches at 100 yards or about 11 inches at 300 yards firing M1906 150-grain Ball ammunition.