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I believe we have the same problem!
There is a spring that pushes the hop up/barrel towards the gearbox, but is stopped by some piece. My piece broke off(probably not your problem). This piece stops the hop-up from getting too close to the gearbox. If it's broken(small piece), this stops the feeding from the magazine. There is not enough room for the bb to enter the barrel. This happened to me, so I took off the spring from the barrel. You align the hop up properly with the mag, and voila! But after like maybe 20 bbs, the barrel slips fowards and the entry space into the hop up becomes too big, causing an air leak(probably your problem). The bbs either go into the barrel but don't have enough power to get through, or just don't go into the barrel.
Well, hope I helped. I tried to find a way to immobilize the barrel when it's in the correct position. But I still can figure out how to do so without having it permanently in place.
Good luck. If you have other questions pm me. Might not help, but whats to lose?
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