The M240B system of operation is described as which option?

The M240B system of operation is described as which option?

• A. Lowering bolt
• B. Gas blast, auto only
• C. 1100M
• D. Blocks the sear

Answer: (B)

The M240B operates as a gas-operated, auto-only weapon. When a round fires, high-pressure gas is tapped from the bore into a gas port and directed into a gas mechanism (a piston). This gas blast drives the bolt carrier rearward, causing extraction and ejection of the spent case, then the action is re-cocked by the return spring for the next cycle. Because this cycle is continuous as long as the trigger is held, the weapon is used in automatic mode only in standard configuration, with no semi-auto setting. The other options don’t describe how the weapon actually cycles: lowering the bolt is just part of the cycling process, a range figure isn’t about operation, and blocking the sear isn’t how the standard operation is characterized.

The M240B operates as a gas-operated, auto-only weapon. When a round fires, high-pressure gas is tapped from the bore into a gas port and directed into a gas mechanism (a piston). This gas blast drives the bolt carrier rearward, causing extraction and ejection of the spent case, then the action is re-cocked by the return spring for the next cycle. Because this cycle is continuous as long as the trigger is held, the weapon is used in automatic mode only in standard configuration, with no semi-auto setting. The other options don’t describe how the weapon actually cycles: lowering the bolt is just part of the cycling process, a range figure isn’t about operation, and blocking the sear isn’t how the standard operation is characterized.