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Automatic firearms work with a kind of "manual conveyor belt" mechanism. Tapping the trigger will fire a single round, akin to semi-auto fire. Holding the trigger activates a small set of gears that turn at a remarkable rate, ejecting an empty shell and replacing it with a fresh round at a continuous rate. Semi-auto doesn't have that same mechanism, or it is rendered inactive in semi-auto fire mode. The rate of fire is determined by how quickly multiple rounds are shot, or how quickly the gears turn. Examples of auto fire weapons are the SAW and M4A1, the latter having a semi-auto fire option.

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15y ago

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