If you are experiencing issues with semi-automatic as your AEG gets older, the likelihood is your switch assembly/trigger contacts have become corroded and need replacing. Fortunately, KRYTAC is here to provide a complete pre-wired switch assembly, complete with their in-line MOSFET which provides protection to the circuitry and prevents the AEG from firing if the battery voltage drops too low. The assembly comprises the trigger contacts, MOSFET, automotive fuse, male Deans connector, and spade connectors, all wired together and ready to go once installed.