For what caliber? You won't find a completely collapsible wire stock for a .223/5.56 rifle that doesn't have some kind of piston conversion with forward recoil conversion as well. If you have a standard AR with direct impingement gas system and buffer tube, you won't be able to ditch the buffer tube coming out the back of the receiver. And that kind of kills the point of the collapsible stock.
Maybe a .22 rimfire with its own receiver contained recoil system.