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Most likely the bottom of your nozzle is broken. I found this in a WEI Tech Dragon a few weeks ago, slide wouldn't go full forward when BBs were in the mag, but was fine without BBs. Under the nozzle is a rectangular piece that strips the next BB off the mag and pushes it up the feedramp into the breech. If the part under the nozzle is broken off, a BB will get stripped off the mag but only go up the feedramp halfway and stay there.
Nutshell, verify this and buy a new nozzle for it.
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