The M9 pistol failing to eject the cartridge is called which type of stoppage?

The failure of the M9 pistol to eject the cartridge is referred to as a "stovepipe" stoppage. This occurs when a spent cartridge casing becomes stuck in the ejection port instead of being fully ejected from the firearm. It typically happens due to a failure in the cycling process, often caused by insufficient recoil or a malfunctioning extractor. To resolve this issue, the shooter needs to clear the obstruction and ensure proper functioning of the firearm.