I've pondered the same thing myself, obviously there's a market for grip adapters and presumably it's a fairly simple item to make. I have some friends in the machine shop business that could crank them out for a reasonable price per unit. The questions that really need to be asked relate to the legality of reproducing them. Would there be copyright infringement or patent issues? If a person was making them for resale would it create legal problems?

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"Shall not be infringed"