Not all single-shot firearms have extractors, though many do. For rimless cases, the groove at the base serves as the grabbing point from which the extractor works. For rimmed cases, the protruded rim serves as the grabbing point from which the extractor works. Extractors are also found on revolvers, removing cases either in succession (as in a fixed-cylinder single-action revolver) or simultaneously (as in a double-action revolver with a swing-out or top-break cylinder). Simplified 3D model of an ejection processĮxtractors are a hallmark feature of repeating firearms, and can be found on bolt-action, lever-action, pump-action, semi-automatic, and fully automatic firearms. Some such extractors can push hard and far enough that it completely clears the cases out of the gun, therefore also performing the function of an ejector. double-barrel shotguns) and revolver firearms, the extractor is a protrusible piece on the barrel/ cylinder side, with flanges that pushes rearwards on the casing's rim and slides it out of the chambers. In modern dropping block, break-action (e.g. It is typically aided by a protruding ejector in the receiver or the bolt, which provides an opposite counter-push that couples with the extractor pull to expel the casing entirely out of the gun. In repeating firearms with moving bolts, the extractor is often one or a set of hook-like flanges on the bolt head that grab onto the casing's rim, so when the bolt moves rearwards the casing is pulled out of the chamber. In breechloading firearms, an extractor is an action component that serves to remove spent casings of previously fired cartridges from the chamber, in order to vacate the chamber for loading a fresh round of ammunition. The opening lever and the safety catch are visible
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A view of the break-action of a typical double-barrelled shotgun, with the action open and the scalloped triangularly shaped extractor visible at the base of the two barrels.