Company Level Army Board Weapons Practice Test

Which cooling method describes the M240B?

Liquid-cooled. Air-cooled. Water-cooled. Forced-air cooled.

Correct Answer:

Air-cooled.

Explanation:

Cooling method for automatic weapons relies on how heat from sustained firing is removed. The M240B is designed as an air-cooled, gas-operated machine gun, meaning its barrel dissipates heat primarily through ambient air that flows around and over the barrel as it’s exposed. There’s no liquid cooling jacket, radiator, or water-cooling system on the standard configuration. When the barrel gets hot, crews swap in a fresh barrel to keep performance up, rather than relying on a liquid cooling cycle. Some designs use forced-air with a fan, but the M240B does not rely on an active cooling device in its normal setup. Because of that, air cooling best describes this weapon.

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