I have a MAK-90 with a stamped reciever  that I want to convert to pistol grip config and I need to know about the butt stock.  I am looking for a black poly set so IronWood is not an option at this time.  When it comes to the polymer buttstock, do I have to do any work to make it fit, for example, use a dremel to grind away at it?  I would like to find a stock that requires no drilling or anything to make it fit?  Any ideas or will I have to work with the stock no matter what?

One of the USA made stock sets will fit but will require some sanding and you will have to drill a couple of pilot holes for the stock screws.
www.k-var.com/subcatmfgprod.asp?0=270&1=271&2=1082
Not that much material needs to be removed so a Dremel tool is not needed just some sandpaper.