I bought a pcp compressor for <$185 at Walmart and it works great so far. I also have a gx cs2/3 but the new one from wallyworld fills my guns in <1/4 of the time of the gx. I wanted it a little more travel friendly so I added my own cooling system consisting of 2"pvc a new water pump(fits inside 2"pvc)2 radiators with 3 cooling fans. Working great so far.