What is a critical action before using the M240B?

Performing a function check is essential before using the M240B because it ensures that all components of the weapon system are operating correctly and safely. A function check encompasses verifying that the firearm cycles properly, the safety mechanisms are functional, and that there are no malfunctions that could pose a risk during operation. This step confirms that the weapon is ready for use and can function as intended when engaging in tactical scenarios.

By conducting a function check, operators can identify any potential issues such as misalignments, dirty components, or other mechanical failures that could impede the weapon's performance. This precaution is critical for maintaining readiness and ensuring effective operation under the stress of tactical conditions.