Just so it's recorded, the CA AUG does not have this same concern. The BB inlet is designed differently such that the magazine will feed with or without the barrel installed, and the hop-up chamber is seperate from the part that feeds the bbs from the mag.
If the barrel is removed with a loaded mag still in the gun, the mag will simply eject all of it's bbs into the reciever (annoying, but not likely to break anything).
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