Which step is NOT part of the cycle of operation for a firearm?

The correct choice identifies cleaning as not being part of the cycle of operation for a firearm. The cycle of operation refers specifically to the sequence of mechanical actions that occur when a firearm is fired, which includes processes that enable the firearm to function effectively with each shot.

Feeding/chambering involves the movement of a cartridge from the magazine into the chamber, preparing the firearm to be fired. Cocking pertains to the mechanism that readies the firing pin or striker for release when the trigger is pulled. Extraction refers to the process of removing the spent casing from the chamber after the cartridge has been fired. Each of these steps is integral to the operation of a firearm, affecting its performance and reliability.

In contrast, cleaning is an important maintenance task that ensures the firearm operates smoothly and safely but does not occur as part of the firing process itself. It is performed separately to remove dirt, debris, and fouling that accumulate from regular use and is not included in the operational sequence that occurs with each discharge of the weapon.