Lever-delayed blowback
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Lever-Delayed Blowback is a form of blowback that uses a two-part bolt with a lever to delay the action. When the round is fired, the cartridge pushes against the bolt face that moves the delay lever upwards so the bolt carrier moves back at an accelerated rate relative to the bolt. This increases the resistance on rearward movement of the bolt and allows for a lighter operating mechanism that would be necessary without the mechanism.
