40mm Co2 Shell Like new, in perfect working order This shell fits a few paintballs, or anything else you can fit in it, like a handful of BB's. The end accepts the rubber end caps made for these types of shells, one will be included. On co2, this thing can be NASTY, I'd recommend using propane if you're using this in cqb. Only issue is a tiny scratch, pictured above. Price is shipped, not interested in any trades.