I installed the CNC Warrior RPK Integral AR Tube Side Folder (Right) on my AES-10B.  It took some work to get it installed.  Sorry I didn't take any pictures.  There is a very ingenious build aspect to it.  The hole in the deepest of the receiver has a slot and a free area for a nut to fit.  A friendly recommendation, once you have the screw in the channel, put a piece of black electrical tape on the back to make sure it stays in the channel.  The installation will required some love taps.  



I tried this the first time without any oil (CLP) and that was a mistake.  The folder took a casualty (harbor freight rubber mallet).  So I went back and bought a fiberglass one, used some CLP and installation was tight but that's a great fit.



I painted a Magpul ASC-L stock which is nice.  I wanted to allow for a different length of pull since I want anyone to be able to use the rifle.  When folded, the stock will not lie flat, but it locks up well with very little wobble.  

Long story short, I really like the product and I'm very excited for it to complete my rifle (optics to come).

Looks like a nice piece,  though I'm not feeling the Nerf color scheme

The color is much less shiny in person.  The Flash really highlights the color.

Must either be the AES-10B or you got sent the wrong stock.  My square back Vepr (Russian Molot RPK receiver) fit perfectly, no tools other than a screw driver needed.