I built a Mad Ghost a couple weeks ago with my friend qwertyman and we thought that the barrel design could be drastically improved and could get ridiculous ranges. See the stock 3DBBQ Mad Ghost got only 60 feet of ranges and mine can get around a hundred. The original has a cool rifling system but is in PVC not CPVC or brass so you have to use electric taped Stefans which are really light and don't fly well. With my simple tweaks it probably doubles its ranges and could be optimized to your preferences. All I did was make a copper and brass RSCB clip, make the pump farther out with a 1 1/2 inch coupler, and offset the trigger RSCB area to be more comfortable for me because I am a lefty.
All in all the mad ghost is a great gun and has great potential. I will be making an original homeade writup thanks. Mad Ghost link: Mad Ghost