This is a brand new mag though firing brand new Excell bbs. Just took it out of the plastic box. I don't think it is because of dirt. It might be operator error though. How long do you need to crank on that wheel on the bottom before your fire? I cranked for a little bit, until there were BBs feeding in the top of the mag, but then I started shooting and didn't crank again until it stopped feeding. But that didn't help it... Do I need to crank on it a whole lot?
Thanks,
Chris