What does a 'primer pop' indicate?

A 'primer pop' typically indicates that the primer of a cartridge has ignited, producing a small detonation sound or flash. This event signals that the primer itself is functioning as intended, and when this occurs, it generally leads to the ignition of the gunpowder in the cartridge.

The correct answer to the question focuses on the implications of hearing a primer pop. When the primer pops, it suggests that the primer has successfully ignited, eliminating the possibility that the cartridge does not contain gunpowder or misfired due to a lack of ignition. In contrast, options indicating a misfire, a faulty primer, or an overcharged cartridge do not align with the occurrence of a primer pop. A misfire would usually occur if there was no ignition at all, while a faulty primer would not result in any pop sound. Additionally, an overcharged cartridge might behave differently and would not simply present as a primer pop without additional signs of a serious malfunction.

Therefore, recognizing that a primer pop reflects proper function of the primer and indicates normal function within the firing process is critical for understanding cartridge operation and troubleshooting issues with firearms.