KRYTAC airsoft electric guns come standard with an International Rectifier IRLB3034PBF MOSFET. Its sole duty is to protect the trigger contacts. Without the MOSFET, each pull of the trigger will slowly but surely wear out the trigger contacts due to arcing.
The pre-installed MOSFET is not an electronic fire control group or electronic trigger unit and does not provide other features such as burst fire, trigger programming, battery monitoring, or other features found with advanced electronic trigger units like those made from companies like GATE, BTC, Perun, and others.