Which of the following is a key feature of the M240B?

The M240B is a key piece of machine gun technology in the U.S. military, and one of its distinctive features is that it can be fired from a bipod. This capability enhances stability and accuracy while firing in a supported position, making it most effective in a sustained fire role during operations. The bipod allows soldiers to deploy the weapon more effectively in various terrains, providing a better firing platform both in defensive positions and during offensive engagements.

The other options do not accurately describe the M240B. A bolt-action rifle does not align with the functioning of the M240B, which is a belt-fed, fully automatic weapon. While the M240B can certainly be used in many combat scenarios, including close-quarters, it is not specifically designed for that role. Additionally, the M240B does not come with a removable suppressor as a standard feature, and while suppressors can be fitted to certain weapons, that is not characteristic of this machine gun. Hence, the ability to be fired from a bipod stands out as a significant feature of the M240B.