Perun Airsoft show you how to install the Perun V3 Optical MOSFET on your AEG... "Perun V3 Optical is a device that replaces mechanical contacts in version 3 gearboxes with an electronic circuit based on MOSFET transistors and adds a multitude of new functions to your replica.

Elimination of mechanical contacts solves the problem of their gradual wear. MOSFET transistors utilized in Perun V3 Optical have a much lower resistance than contacts, which also increases rate of fire. Small elements in the trigger mechanism responsible for semi-automatic fire frequently malfunction, especially in replicas built on parts made by many different manufacturers. Perun V3 Optical minimizes the number of moving parts in your replica, increasing reliability and ensuring proper functioning of all firing modes. Perun V3 Optical itself has no moving parts at all thanks to use of optical sensors for gear, trigger and selector plate detection."