I have done a lot of work to this thing. Baisically all the internals have been changed. It has a matrix gearbox with a mosfet that can have a sensitive trigger 3 round burst and binary. I have upgraded a bunch of different parts internally. It has a new HopUp unit and a stubby stock so it has a lot of battery space. The full auto does not work and the charging handle is missing. The selector switch is loose. It is not very consistent because it probably needs a new bucking. Message me if you have any further questions I am open to reasonable offers Can send a video of it working. No trades.