What is the first step in the functioning of an M4 Rifle?

The initial step in the operation of an M4 rifle is feeding. This process involves the movement of a cartridge from the magazine into the chamber of the rifle. Without this crucial first step, the rifle cannot fire because there would be no ammunition prepared and ready to be engaged in the chamber. Feeding ensures that the firearm is primed with a round, which sets the stage for subsequent actions such as chambering, cocking, and ultimately firing. This foundational step is essential for the overall functionality of the weapon, as it allows the rifle to operate as designed, following a specific sequence that ensures reliability and efficiency in use.