A quick look at the Well R2 Vz. 61 Skorpion AEG available at Taiwan Gun in Poland... "R2 [WELL TGG] is a replica of Vz61. The skeleton, butt and small parts of the R2 replica are made of metal, while the upper part of the housing and the grip are made of plastic.
The replica's hop-up system is adjustable.
Set includes: