Yup, its an "arm brace", actually Centurys copy of the Sig brace. Came with the gun. I think it looks clunky too, but hey, this is Washington and its the best we can do. Overall its a well put together little thing.......I'll need to spend a bit of time at the range before I knoiw if I really do like it. And it is a Zastava, the latest iteration of the Yugoslavian AK. It does have a LITTLE wood on it........
Oh, and the trunion is unmodified, the sysrem is attached with the grip.