Looking for a m4 or similar. Looking for a emg specific. The emg could need some work. Sr25 works flawless. Shoots great and far. Needs nothing. Stock matrix body baal steel bore up cylinder Maxx double oring piston head angel custom thor 2 piston Matrix sr25 high torque gears M150 spring Perun mosfet Tinley 30k motor Prometheus 6.03 barrel. flat hop