G&P M4 project. I've been trying to get this thing together working but I have just had no luck. My misfortune might be your lucky snag.
Includes G&P receiver, Madbull rail, choice of stock, and the following internals:
Retro Arms Split gearbox w/ integrated hopup
SHS 18:1 gears
Gate Titan Mosfet
SHS Tappet Plate
SHS/Rocket 16TPA Long High Torque Motor
Lonex Enhanced Cylinder Head and Nozzel
G&P Cylinder
G&P Stock inner barrel
SHS 15-tooth Full Metal Rack Piston w/ Piston Head with Sorbo pad and shaved first tooth
G&P T1 Replica for an extra $35
$500 obo