my grandfather has the O.S. .30 setting on a tmaxx which ahd the origanal .21 conversion kit. all he did was swap motor and the like F**ker hauls balls with that motor. he took it apart the first day he got it and done some porting on the sleeve before he even broke it in. I would have to say that that motor is one have of a piece of work.

Good Job and good luck with future products.