What is the first step in Stage 1 when performing a function check for the M240B?

In Stage 1 of performing a function check for the M240B, the first step is to place the safety on "F" fire. This action is vital as it prepares the weapon for the function check, ensuring that the firing mechanism is being tested under the correct operating conditions. By setting the safety to "F," the operator can assess whether the weapon fires properly when the trigger is pulled, which is a critical part of evaluating the firearm's readiness and functionality.

This initial step also emphasizes the importance of weapon safety, ensuring that subsequent checks can be performed with a focus on the weapon's operational integrity while maintaining control of the safety features.