Both my SVU and M76 are made of wood. The synthetic finish on the bullpup is mostly due to drenching in varnish before painting with textured Krylon. At least for me, its an easy alternative to fiberglass and it works well.
I made the kit of the Zastava on an AK being easier to make than gutting out a real one and fitting with AEG parts. So yeah, its a ######, but a pretty one. The foregrips seem longer than normal because its on the receiver of an AK, which is considerably shorter than an M76.