What can affect the accuracy of a sustained fire machine gun?

Barrel overheating and excessive wear significantly affect the accuracy of a sustained fire machine gun. When a machine gun is fired continuously, the barrel can heat up rapidly. This heat can lead to several issues, such as warping of the barrel or changes in the internal dimensions due to expansion, which can alter the bullet's trajectory.

Excessive wear can result from prolonged use, leading to erosion and a loss of precision in the barrel’s rifling. As the rifling degrades, the bullets may not stabilize as effectively, causing them to stray from the intended path and result in a dispersion of shots. Therefore, maintaining the barrel's integrity and managing its temperature during sustained fire is crucial for preserving the accuracy of the weapon.

In contrast, while factors like wind direction, quality of ammunition, and the shooter's position play important roles in overall shooting accuracy, the immediate impact of a heated and worn barrel in sustained fire scenarios makes it a primary concern for maintaining precise shot placement.