My JG G36 only fires one bb on full and semi auto. But it only does this during a game not at home. Everything seems to be fine my mag, the gun itself, everything. Once I take the mag out I can see one bbs sitting there in the chamber. I do use silicon oil and clean the barrel after every use. I also googles this and the only real answer I got was something about a "sweet spot" in the trigger, anyone know if that's it or is it something else?