What is the projectile fired from the minigun?

The minigun typically fires 7.62 mm rifle bullets, which are designed for high rate-of-fire applications. The 7.62 mm round is prevalent in several military firearms, and it provides a good balance between range, impact, and accuracy, making it suitable for various combat scenarios where the minigun is deployed. Its capability to provide suppressive fire and engage targets effectively at different distances enhances its efficacy in aerial and ground support roles.

In contrast, 5.56 mm bullets are generally associated with smaller caliber rifles, which would not meet the minigun's specifications or operational requirements. Similarly, 9 mm bullets are primarily used in handguns and submachine guns, while 12.7 mm bullets, which represent a much heavier caliber, are typically used in heavy machine guns and sniper rifles, not in the context of the minigun's operational use. Thus, the 7.62 mm bullet is the correct projectile for the minigun, aligning with its design and intended military applications.