All AEG's do not fire the last 4-5 BB's. The push pin doesn't push up high enough to individually feed them into the hop-up (not 100% sure, don't quote me). This is why everytime you take the mag out when it's loaded, a few fall out. If you turn it upside down, it probably will fire them, but I don't recommend this since it's the opposite way of using the hop up.
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