I know this forum doesn't get a ton of traffic anymore (shame ), but some people may appreciate this.
Here's my GSG AK-22 "Rebel Edition". I just added the triangle folder today. Since it's a .22lr, I just picked up a $25 steel airsoft triangle folding stock that was nearly a perfect replica and filed a few places a hair at a time until it fit and functioned perfect. Also opened the latch area on the stock a little bit so it would lock up solid open and closed. I got the folding adapter and solid polymer folder set just to use the folding adapter. Also pictured is my SilencerCo Sparrow St