yeah, novak's handgunner outlet is working on +X round extended base pads for making limited guns out of the M&P. Last i chatted with them, they are only up to 18+1 rounds though, and it's still in the prototype phase. They are also working ona magwell to go with.
I doubt they are the only people working on such things.
This is their website if you want to get in touch with them.
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