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Hi Beanie, that is a known limitation of all GBBr. Propane is cold as Pharaoh said. Sustained rate of fire like that will definitely give that result. In your video, I believe its not the bolt that freezes but the magazine valve.
GBBrs have 30 rounds only so you should not experience that in the field because you wont be firing like that in a single mag. In fact, KJW Tanio Koba system is good enough to sustain continous 30 rounds of fire without freezing up. Some other system cannot even sustain continous 30 rounds of fire, they freeze up quickly.
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Unseen but Certain
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