What is the sustained rate of fire for the M240B?

The sustained rate of fire for the M240B is accurately identified as 100 rounds per minute. This rate is determined based on the operational requirements of the weapon, which emphasize maintaining accuracy and controlling heat buildup during prolonged firing sessions. The sustained rate allows gunners to effectively engage targets while preventing overheating, ensuring reliability and performance over time.

Sustained fire is specifically designed for scenarios where a consistent and controlled output is crucial, enabling effective suppression of enemy positions and maintaining combat readiness. Additionally, this rate is part of a broader strategy that incorporates various firing techniques to optimize the weapon's effectiveness in different combat situations.

In contrast, the other options represent rapid or cyclic rates of fire that may not support sustained engagements but rather focus on short bursts intended for overwhelming enemy positions or for close quarters, which could lead to overheating and potential weapon malfunctions if maintained for extended periods.