[Hectic]

Ok so im gettin a Cyma mp5k tommorow maybe the pdw version havent decided yet.
At any rate id like to eventually build it for a higher rate of fire. Say 30-40 rps.
How could i do this on a relativly small budget say under a hundred bucks?.
Swiss cheese the piston?
Maybe remove a few teeth from the piston (short stroke i think they call it)
I dont wanna go lipo so i guess just stick with the 9.6.
High speed motor? Gears?
Lookin to keep it cheap, simple and reliable.
Thanks in advance for any input.