What is a 'stove pipe' in firearms terminology?

In firearms terminology, a 'stove pipe' specifically refers to a situation in which a spent cartridge casing becomes lodged vertically in the ejection port of a semi-automatic firearm, resembling a stove pipe. This typically occurs when the firearm fails to completely eject the casing after firing. As a result, the casing does not fully clear the action of the firearm and instead stands upright, blocking the chamber and preventing the weapon from firing again until the obstruction is cleared.

Understanding this terminology is crucial for operators as it affects the operation and reliability of the firearm. Proper knowledge of such malfunctions allows for effective troubleshooting and remedial actions to ensure the firearm functions correctly in critical situations.