The stock trigger is the largest point of resistance in your gun, by a REALLY significant amount.
What a MOSFET does is it bypasses your trigger.
Think of the MOSFET as a dam between your battery and motor. Your physical trigger is what signals the dam to open. There's WAY less resistance through a MOSFET than there is through your trigger contacts.
Because your trigger isn't hooked up to the motor, it has only minimal amperage going through it, prolonging the life of your trigger contacts.
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