I have a G&G scar-l and it sometimes happen that bb roll in the body.
I know for shure it happen when i get excited and insert mag way to fast so the mag dosent aling properly with the hopup and with a tap on the mag bb are eject from the mag and since i'm reloading they are pushed up inside the body and they find a way around the hopup to end up inside the upper reciver.
It usualy happen when a mag change is required. (hihg low or mid)
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