THIS TANK IS BEING SOLD AS OPEN BOXThis tank is the newest Heng Challenger 2 Pro with not only steel gearboxes but also some of the latest electronics from HL, the 6.0S electronics system.This is the airsoft Heng Long Challenger 2 equipped the 2.4GHz radio system with the volume and smoke unit control on the transmitter. This tank has the dual sound package and has separate up and down elevation offered from Heng Long.This tank comes equipped with steel gearboxes, metal caterpillar tracks, metal drive wheels, and metal idler wheels instead of