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but not so fast that dangerous pressures escape. Blowback firearms sometimes lack an extractor as they really aren't necessary for this method of operation.; Delayed blowback: This action is found where recoil is light enough that a fully locked breech is not necessary. Like simple blowback, it is case movement that opens the breech. This is a more robust version of simple blowback. Sometime a spring loaded lever is used to increase the resistance inertia of the slide/breech to keep the case in the chamber long enough to be safe. Other versions

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