The VFC Avalon ECS M4 Complete Gearbox. M4 Avalon AEG style fits in all the VR16 Avalon guns by Elite Force. A fully built and ready to the drop-in gearbox with all its parts ready to go. Fits airsoft M4 AEGs (VFC) and may fit other models. Comes with what is pictured. A very high-quality Version 2 (V2) gearbox made by VFC ready to go.
