As far I can tell that's just a Hogue stock with a trademarked camo pattern on it.
What improvement are you looking for? Better grouping? Less weight? Stiffer foreend?
The Hogue stock can be improved significantly by stiffening the foreend with epoxy and perhaps carbon arrow shafts. Bedding the action makes it super consistent and will let it shoot as well as it possibly can.
If you're looking to reduce weight then you need to spend money - Ken Henderson who makes Hi-Tec stocks may well be finalising a model to fit. He does have one ready to fit the Mini @ROKTOY
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