This is built to be my teams DMR. The reason behind the length and FPS is because I need to be able to breach buildings and rooms with my team and maneuver easily inside. The shortened barrel makes it easy to go around corners and long enough (for airsoft anyways) to be able to reach out farther then my team mates. It has damn near perfect compression so every bit of air goes to pushing the BB.
Internally not a lot has been done in the way of parts. Most of the work has been compression related (which I did not do myself).
Prometheus tight bore barrel
Guarder reinforced tappet plate
SRC high torque motor
Systema Air Nozzle
MOSFET with braking