Which type of firearm "pushes" the extracted round from the chamber?

The correct response is associated with break action firearms, which utilize a specific mechanism for extracting spent cartridges. In break action firearms, when the action is opened (usually by breaking the barrel down), it allows gravity and mechanical advantage to push the spent round out of the chamber. This is achieved through the mechanical design of the action, which often includes an extractor that provides the necessary force to push the casing out when the firearm is opened.

In contrast, revolvers typically use a different system where the fired cartridge case is ejected manually or automatically but not "pushed" from the chamber in the same way as with break action mechanisms. Single action firearms can vary in their design, but they primarily rely on the specific characteristics of their trigger and firing mechanisms rather than on a pushing action for extraction. Rifles, depending on their action type (bolt, semi-automatic), utilize various mechanisms for extraction, such as fluted chambers or mechanical extractors, rather than a push method.