Which rate of fire of the M2 is used for bursts in a sustained manner?

The sustained rate of fire for the M2 is designed for maintaining effective firing over a longer duration without overheating the weapon. This method allows operators to fire at a controlled, manageable pace, which helps in maintaining accuracy and reducing the likelihood of ammunition overheating. The sustained rate is critical for maintaining effectiveness in combat situations, allowing troops to provide continuous support while ensuring that the weapon remains operational and reliable over extended engagements.

In contrast, other rates like the cyclic rate involve firing as quickly as possible, which could lead to rapid overheating and increased wear on the weapon. The rapid rate, while faster than the sustained rate, is still intended for short periods and not for prolonged use. Single shot refers to firing one round at a time, which is not suitable for engagements requiring sustained bursts of fire. Thus, the sustained rate offers the best balance between effectiveness and weapon longevity during extended firing situations.