What is the first step in adjusting an M240's rear sight in the vertical position?

The first step in adjusting the vertical position of an M240's rear sight involves identifying the current sight position. This step is crucial because it provides the baseline needed to make informed adjustments. Knowing the current position allows the operator to assess how much adjustment is required to achieve the desired sight picture.

Without this critical understanding, adjustments could be made blindly, which may lead to inaccurate aiming and potential performance issues during firing. Identifying the current sight position enables the operator to effectively plan and implement the necessary changes, ensuring that the adjustments made will enhance the accuracy and effectiveness of the weapon system.