
Im thinking 12g CO2 cartridge with a chamber with 20-30 ci or less to get at least 140psi, and interchangable barrels(sch 80 PVC for paintballs, 3/4" sch 40 PVC for the empty cartridges, and 1" sch 40 PVC for C batteries and bouncy balls)
I will probably do smaller pneumatics to get some experience before taking on this project