Which of the following is the sustained rate of fire for the M240?

The sustained rate of fire for the M240 is indeed 100 rounds per minute, achieved in manageable bursts of 6 to 9 rounds. This rate allows for effective engagement of targets while minimizing the overheating of the weapon and ensuring ammunition conservation. The sustained fire rate is designed to maintain accuracy and control over longer engagement periods, which is essential for ensuring the machine gunner can continue to provide effective suppressive fire without compromising the weapon's operational integrity or reliability.

By employing bursts of this length, the operator can allow time between bursts for the barrel to cool, thereby reducing the risk of malfunctions caused by overheating. This practice is crucial in prolonged engagements when high rates of fire could lead to barrel wear or failure. It's important to recognize that while the option indicates a specific burst count, the overall goal is to maintain a balance between firepower and weapon durability.