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to see if that's the problem, remove the hop up chamber/inner barrel assembly from your gun, drop a BB in the chamber, and through the end that the air nozzle sticks through, try to push the BB through with a pen or other small object. Note how much force is required to push it through. It shouldn't require much at all.
I've experienced really tough penetration with several "hard" type buckings, and the only solution I've found is to widen the hop up chamber walls that the hop up lip touches.
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