What are the consequences of overheating a machine gun barrel?

Overheating a machine gun barrel can result in several negative consequences that directly impact the weapon's performance and longevity. The potential for a cook-off is particularly critical; this occurs when the heat generated by prolonged firing ignites ammunition in the chamber without the trigger being pulled, potentially causing an uncontrolled discharge. Additionally, overheating can lead to decreased weapon efficiency, as the barrel's thermal expansion can affect the accuracy and consistency of the rounds being fired. Increased wear on the barrel is a further consequence, as the intense heat can erode the rifling and overall structure of the barrel, leading to a shorter lifespan and the need for more frequent maintenance or replacement. These factors combined illustrate why maintaining optimal firing conditions is crucial to ensuring the machine gun operates effectively and safely.