When it moves back, the extractor pulls the spent casing of the previous shot from the chamber, and once the case is clear out of the chamber, the ejector kicks the case out of the firearm. In a self-loading firearm ( semi-automatic or fully-automatic), the bolt cycles back and forward between each shot, propelled back by recoil ( recoil operation) or the expanding gas ( blowback and gas operation) and forward by a spring. It is manually unlocked and moved to extract the spent casing and chamber another round. In manually operated firearms such as bolt-action, lever-action, and pump-action rifles and shotguns, the bolt is held fixed by its locking lugs during firing, forcing all the expanding gas forward.
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