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I'm trying to change the spring of my snow wolf m4 and once I've got to the part where I remove the gearbox from the lower, we'll... it won't come out, I've removed all the pins and the bolt catch but now the only thing that prevents me from removing the gearbox is the ambidextrous selector switch, I've tried to put it on semi but the gearbox just won't come off and I don't know how to remove the selector switch since it doesn't have a screw on neither side. Can someone help me with this?