I re-read my original post and what I meant to ask was if anyone was interested in something similar to that, but specifically built for the 15-22.

Like if one of the vendors here started making a 15-22 specific version for a more reasonable price?

A 15-22 version wouldn't have to be nearly as fancy since there is no buffer and bolt to worry about, but a good way to attach to the 15-22 plastic "buffer tube" would have to be found. And it would be a permanent modification. Being able to add a standard buffer tube (mil-spec or commercial) and a non-collapsible stock could be nice. Also, a folding stock on the 15-22 would just be cool.