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How long have you had it? If new, have to set your hop up yet? Most airsoft guns tend to be shipped without any hop up set (not sure why) and BBs will roll out. If you've had the gun for a while, your hop up rubber in the breech might be gone or worn out. Never heard about this happening to a GBB, but AEGs yes and also happened to my TM G17 springer when I wasn't careful enough cleaning the barrel (ripped the bucking right off, never chambered BBs again.)
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