The difference between our co2 tanks is pretty basic. The larger the tank the more Co2 you can fill into the tank so the more shots per fill.
Our tanks ship empty. These can be re-filled at sporting good stores, paintball fields, and many other places. Some Walmart,Kmart, and Sports Authority stores also fill these tanks.
High quality aluminum cylinder with industry standard pin valve
For a quick and easy fix of CO2
6" length by 2" base