Which of the following is NOT one of the eight cycles of function in firearms operation?

The correct identification of the option that is NOT one of the eight cycles of function in firearms operation is based on the established understanding of how firearms function. The eight cycles of function typically include chambering, firing, unlocking, ejecting, extracting, feeding, locking, and cocking. These cycles describe the step-by-step process that occurs within a firearm from the moment a round is loaded until it is fired and the spent casing is ejected.

Calibration, while an important aspect of ensuring a firearm operates safely and effectively, is not considered one of the eight operational cycles. Calibration generally refers to the process of adjusting the firearm for accuracy, testing, and aligning the sights, rather than a mechanical function that occurs during the firing sequence itself.

In understanding the cycles of function, it becomes clear why calibration is not included alongside essential operational processes like chambering, firing, and ejecting, which are integral to the firearm's performance during use.