Mine doesn't wobble.. Maybe you could take the whole bottom half of the stock off, leaving the buffer tube assembly attached to the gun. Then bend the part of the stock/rail that fits into the 'wobbly part' slightly to one side so it puts tension on the wobbly part when you put it back in place. This should stop it moving. Get what I mean?
With regard to the actual grip, I hated the little finger knob that goes between middle and ring finger, so I took to it with a rasp. Then some sand paper. Then some finer sand paper. Now there is no annoying knob and the grip is so much nicer to hold.
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