Ignoring the licensing side of the question, modern sliding AR stocks have less wobble than the old school ones-and some even have none, I have a magpul stock that I can't make move at all that was designed for dmr 308 ar's
Like most things shooting related you get what you pay for, a stock made not to wobble that uses a dedicated buffer tube costs more to make and buy than stuff mass produced to work with every other mass produced component.
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