What component of the M240 aids in preventing overheating during extended fire?

The component of the M240 that aids in preventing overheating during extended fire is the cooling fins on the barrel. These fins increase the surface area of the barrel, which enhances heat dissipation. During prolonged firing, the barrel can become very hot, which can lead to decreased accuracy and potential damage to the weapon. The cooling fins help manage this heat buildup by allowing hot air to rise and cooler air to circulate around the barrel, thus maintaining a more stable operating temperature.

The effectiveness of the cooling fins is crucial in maintaining the reliability of the M240 during sustained combat situations, where rapid firing is necessary. This design feature ensures that the weapon can continue to operate effectively without the risk of overheating, thereby increasing the overall performance of the firearm.