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There used to be a hook on the hop up chamber and it broke off because... well pot metal. It seems like the hook on the hop up chamber is used to stabilize, and prevent the hop up unit and inner barrel from moving. This occurs when the slide blows back. I think its the combination of the barrel tilt, and the force of the hook grabbing onto the frame, that caused that part to break off. Its pretty common and I have never really looked into it because it does not really impede function.
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