My problem was with the ruber, I had installed a guarder clear, but the the little rim at the extremity of the rubber (were the BBs enter by in the barrel) was too big, and the BB were not stopped and were entering freely the barrel.
That's why I was double feeding it was not the SCS. I put back the original rubber (the rim is smaller and it stops the BB from entering the barrel by itself and no double feeding anymore.
Maybe you have the same problem...
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