Selling my upgraded MDR-X. It does not get enough use for me to justify keeping it. The gearbox has been modified to provide more space for the bevelgear, an issue well known on the MDR. The motor is replaced with an Ultimate motor out of an EVO, with a lonex helical bevel and pinion set. Shimmed and greased, runs great. Comes with all the fixes and care packages from silverback, like the updated ETU and buttplate. Original parts, like the motor, are also included. 

Additionally, I have an HPA conversion kit for the rifle, but without engine or board. It is made for the wolverine Inferno and their universal plug board. If you have an engine, its a drop in replacement, easy to convert back and forth between AEG and HPA. Cable to connect to the plug board included. 

Send a pm with an offer.