There was a fellow in the Houston area about 6 months back selling a used 10/22 with what appeared to be the same design but scaled down version of the Mini-14 factory folding stock.
He claimed it was either factory made or a special run of 'dealer special'.
Back in the 80s Ramline made a "sorta copy" of the mini14 folder for the 10/22, and Falcon made a much closer copy, the main difference was an AR15 grip instead of the fatter Ruger version. There was also a guy on Rimfire Central about 3 years ago made a dozen or so copies of his Ruger folder stock mechanism and was grafting them onto 10/22 stocks with the Mini14 gasblock adapted to the front end to make it look more like the mini. AFAIK Ruger never made a factory folder stock for the 10/22.
https://www.rimfirecentral.com/forums/showthread.php?t=824377