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Yeah it's a Madbull 509mm 6.03. Also, don't know if it helps, but the BBs explode outside the hop up chamber, slightly behind it. It's as if the BB would roll or somehow be pushed to the back of the chamber where the nozzle would smash it when I fire. I then have to take out the bolt and let the fragments roll out. What could make the BB roll/move backwards when engaged in the chamber?
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