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

The first step in Stage 1 for performing a function check for the M240B is to place the safety on Fire "F." This action is critical as it prepares the weapon for a function check, ensuring it is set to operate in a live-fire condition while also ensuring that further steps in the procedure can be carried out safely and effectively.

By placing the safety on Fire, you can confirm that all mechanical components are functioning correctly in the intended firing position. This is essential for verifying that the weapon is operational and can safely handle the subsequent steps, such as checking the feed tray and ammunition type. Performing a function check with the safety in the correct position is also a standard protocol that reinforces firearm safety practices. Making sure the weapon is ready for further checks lays the groundwork for an effective and thorough evaluation of the system's readiness.