Well, the short answer is, no. You won't be able to install an underfolder on the WASR 10 without spending a lot of money to have a machine shop modify the assend of the thing. Also, underfolders are not a very good option if you actually intend to shoot the rifle. You can't get a good cheek weld with them and they flex making for poor groups. You can put a side folder on it very easily. From cheap tapco poly side folders to the more expensive, but far better, ACE side folding stocks.