It would appear that the only viable reload would be another cylinder already filled up. But now you gotta find a place to store it, and I wonder whether or not shells are captured in any way or if you grab your spare cylinder the wrong way, do all the shells spill out? Regardless, it's a lot of space taken up on the gear fo six shells. Popping the cylinder off, dumping empties, reloading, then putting it back on seems like it would take a ton of time. Giant sized moon clips?