First thing I'd check is to see if there isn't a piece of broken BB in the barrel. Look for an obstruction in the barrel. Also make sure the hop up isn't adjusted all the way up. In fact, slide the hop up adjust lever all the way off. This will give a 'straight through' path for the BB, or should. If the BB's are still jamming, it could be a problem with the BB's. If you've checked the barrel, and adjusted the hop off and they're still getting stuck, try a different brand of BB. It sounds like the BB's that came with it worked fine, and the others didn't, I would suspect the BB's.
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