Hmm A new Barrel(Progressive, CP 1 Piece, J&J Ceramic)
Maybe a trigger?(Checkit Sweet Spot)
And maybe a loader, i dunno how fast that can shoot,(Reloader, 12v-9v revvy?)
I dont really know very well but im just tryin to help out...
new barrel, mayb a 32 degrees whisper
thats about it unless u want to make it electric in which case u would need to put an electric trigger and an electic hopper