Echo1 ER25 Complete Gearbox
Please note that this gearbox does NOT come with a MOSFET and is wired for a standard connection. This is a complete factory replacement gearbox for the Echo1 ER25K (JP-28).
This uses an elongated cylinder head and proprietary length nozzle, standard AEG pistol rack (with metal teeth), and a standard Ver. 2 gear set, making it more compatible to normal Version 2 (M4) gearbox upgrades. Other brand SR-25 style guns might use a Version 2.5 gearbox with an elongated cylinder and piston and proprietary gearset instead.