It's using the newer Taigen/Torro KV-1 lower. I custom fit a set of the Heng Long all enclosed CNC machined 1/56 ratio (slow) gearboxes to the Taigen hull. It also got a metal turret ring and metal turret drive motor. Installed a FRS7S Visaton speaker in an off the shelf plastic box and printed a speaker grill from ABS for it. It's being controlled by a Clark TK-50SP board and Flysky FS-I6S radio/FS-iA6B receiver.