Which maintenance practice is crucial for machine gun reliability?

Regular cleaning of a machine gun is essential for its reliability. Over time, residue from firing, such as carbon build-up and dust, can accumulate and lead to malfunctions if not removed. A clean weapon ensures proper functioning of moving parts and reduces the risk of jams or misfires during critical operations. This maintenance practice not only extends the lifespan of the weapon but also maintains its accuracy by ensuring that all components operate smoothly.

While storing the weapon in a locked cabinet, using manufacturer-specific lubricants, and repainting to prevent rust all contribute to the overall care of the machine gun, they do not directly impact the immediate operational reliability as cleaning does. Regular cleaning addresses the most common sources of malfunctions directly related to weapon performance.