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Or even a better way to do it is if you have an extra hopup paying around you can chop off the feeding lip of the hopup you want to use right at the bottom flat plate, and then take the spare hopup and cut right above the flat part of the hopup. Then take the two flat pieces and super glue together, sand to get the right height, and dremel out the inside to smooth it out, and voila! Very sturdy extended feeding lip with no mod to lower receiver.
I took a piece of the original feeding piece from the original bottom hopup piece then super glued it to the feeding lip on the new hopup extending it. Then I just added plastic to the bottom of one side of the gearbox to make sure the mag doesn't wiggle