What can prevent a revolver's cylinder from rotating?

The ability of a revolver's cylinder to rotate is critical to its function, as it allows the firearm to cycle through its chambers. When dirt or debris accumulates under the extractor, it can obstruct the movement of the cylinder. The extractor is a key component that helps to eject spent cartridges and creates a seamless connection between the cylinder and the frame of the revolver. If debris interferes with this mechanism, it can prevent the cylinder from rotating properly, thus impeding the operation of the firearm.

While factors such as a damaged grip, excessive lubrication, or design features like a short barrel might affect the handling or performance of the revolver in various ways, they are not directly responsible for blocking the rotation of the cylinder. A damaged grip may affect comfort or control, excessive lubrication can lead to operational issues but in a different context, and a short-barreled design doesn't inherently affect the mechanical operation of the cylinder rotation. Hence, the presence of dirt or debris under the extractor poses a direct mechanical issue that can hinder the revolver's functionality.