There could be two reasons for the double feeding. I just corrected mine.
1- The hopup system is to tight on the bb which causes the bb to stay in the hopup chamber. This would cause 2 bbs to enter the chamber and be shot out. Check this by taking out the hop up with the inner barrel. Manually place in a BB and blow it out. It should escape quite easily with little resistence. But also be able to hold the bb there.
2- The antireversal spring is damaged or is installed incorrectly this would cause 2 or more bbs to enter the hopup chamber. Check the spring for damage.
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