Chechereche Airsoft goes over the affordable Matrix Sportsline M4 AEG With G3 Micro-Switch Gearbox that is made by S&T Airsoft and distributed by Evike. The G3 gearbox, a Matrix and S&T joint project, has all the G2 features like a microswitch trigger, better steel gears, steel piston teeth, and aluminum cylinder. It also has a new QD spring system for easy spring changes and an inline MOSFET with over discharge protection. The electric trigger uses a magnetic sensor for faster response.