We're talking about PSG-1's here. Not standard AEGs.
The function is opposite, where the piston stays cocked in the off cycle. It allows for instantaneous shots on trigger pull. The wind up cycle occurs after the piston is released.
This is why PSG-1 upgrades require so much torque - being able to crank an already cocked spring from a resting position requires way more current and torque than normal functioning AEGs do.
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