It went right into place and locks in place. The issue now is to lock it in retracted position. This means making a small square in stock (hacksaw/dremel/file).
The price was around 60 € at Zib militaria for the stock.
Yeah its nice, I think E&L AR`s are somewhat underrated. Looks kinda like the real thing, nice grey finish on the body + it has QSC. The platinum versions come with steel parts (such as outer barrel, front sight etc).