You just need to buy the stock itself, as the 15-22 has a fake receiver extension molded into the lower. Any stock that is "Mil-spec" in size will fit your 15-22, don't buy "Commercial". Again, these terms refer to size of the tube they slide onto, not quality of the item, and it will always be specified in the item description. There are lots of stocks out there, but I highly recommend Magpul stocks. Check out the MOE, CTR, and ACS.
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