Works great iv built it out of spare parts i have laying around 400fps on a 11.1 About 20rps Parts list Upper-lower reciver valken Hanguard valken Outer and inner barrel valken Buffer tube and stock lancer tactical Motor grip krytac 18:1 sector and swivel gear 12:1 bevel gear 18k high torque motor Tappet plate valken Full metal teeth piston shs Cylinder and cylinder head valken Mosfet is out of a lancer tactical proline series Buyer pays shipping Cash is king but willing to trade