Which feature of the M240 is used for elevation adjustments?

The rear sight slide is responsible for making elevation adjustments on the M240 machine gun. This feature allows the operator to adjust the sight line vertically to ensure accuracy when aiming at targets at various distances. By moving the rear sight slide up or down, the shooter can compensate for bullet drop or other factors affecting the trajectory. This is critical in achieving effective fire by aligning the weapon’s sights with the target to account for distance variations and enhance precision.

The other options pertain to different functions of the weapon. The front sight blade is typically stationary and serves as the point of aim. The windage adjustment knob is used to correct left or right aim but does not affect elevation. The trigger mechanism is purely related to firing the weapon and does not assist with sight adjustments.