G&P I5 Gearbox for for M4 / M16 AEG

G&P I5 Gearbox for for M4 / M16 AEG Advise using 11.1v Lipo Battery Include: I5 Gearbox I5 Gearbox Trigger Board (GBX015) I5 Trigger 8mm Bearing 150% Spring Metal Cylinder Cylinder Head Nozzle Spring Guide Metal Piston Torque Up Gears