Many people believe that battery power does not matter in semi-auto, that as long as the motor has enough power to pull the piston then a shot can be completed satisfactorily. This concept is totally wrong. A gun’s FPS is partly determined by how fast and powerful the piston is moving forward. With enough battery power, the motor can afford to pull the piston and the spring fast and hard. In return, the spring will be much more powerful in its “return movement” and will push the piston much harder.
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