High Quality Content by WIKIPEDIA articles! An extractor is a part in a firearm that serves to remove brass cases of fired ammunition after the ammunition has been fired. When the gun's action cycles, the extractor lifts or removes the spent brass casing from the firing chamber. Extractors can be found on bolt action, lever-action, pump action, semi-automatic and fully automatic firearms. Break-action shotguns, such as those with single or double barrels, typically have an extractor that operates when the action is broken open. Extractors are also found on revolvers, removing cases either singly or all at once. For rimless cases, an extractor groove in the ammunition may serve as the point from which the extractor works. For rimmed cases, the rim of the cartridge serves most commonly serves as the point from which the extractor works. Not all firearms have extractors. In bolt action, lever-action, pump action, and semi- or fully-automatic firearms, extractors typically work in conjunction with ejectors to remove completely a fired, empty cartridge case from the weapon. The extractor removes the cartridge case from the chamber, essentially pulling the case to the rear.