What typically causes a shotgun to fail to eject a round?

A shotgun may fail to eject a round due to a malfunction of the ejector, which is the component that physically removes the spent cartridge from the chamber after firing. If the ejector is broken or damaged, it may not properly engage with the cartridge, leading to failure in the ejection process. This mechanical failure can prevent the shotgun from cycling correctly, causing the shooter to experience a jam or a misfeed.

In contrast, over lubrication might cause sluggish action, but it typically does not directly result in failure to eject. Inserting the wrong type of ammunition could lead to feeding issues, but not specifically to ejection failure. Lastly, while lack of cleaning can impact overall function and reliability, it is not a direct cause of failed ejection like a broken ejector. Understanding this mechanism is crucial for diagnosing and fixing issues during shotgun operation.