i was playing around with it for like 20 hours.
disassembled this gun probably up to 15 times already.
the 2 piece hop up unit is NOT TM compatible. So the TM hop up unit WILL NOT work. The reason being that the stock airseal nozzle has a slot on top of it to give it smoother movement, and the stock KWA hop up unit also has a hollowed out slot for it to move through.
but the TM hop up unit doesnt, so you won't be able to shoot any BBs at all without changing the airseal nozzle.