To use the open sight:
Fig. 5
1. Look through the sighting notch at the target. ([Fig. 5].)
Fig. 6
2. Bring the top of the front sight on a line with the top and in the center of the sight notch, the top of the front sight being just under the bull's eye.
Because of its wide field of view and its readiness in getting a quick aim with it, the open sight is the one that is generally used in the later stages of battle, or when fire is to start immediately.