I have my own 40 lb big c02 bottle that I use to fill my bottles. You may want to contact a Scuba shop or paint ball shop to help you out. Perhaps another racer in your area has a large bottle.

The way you fill the small 10oz or 2.5 lb bottles is you put them in a freezer or cooler with ice let them get cold and connect 10 oz to the 40lb via hose and open both valves until you stop hearing the air transfer.


Here is a pic of my bottle.

Sean