What is with the rear trunnion/stock assembly? Looks like they are using a normal rear based on the rivet pattern, with an under folder grafted on. Plus a QD swivel?
Yup, it's a bolt on underfolder stock on a standard fixed stock trunion. Kinda neat in that you can switch between the underfolder and a standard fixed stock, however if what you want is a "clone correct" yugo underfolder this is not that.