There's a guy on Ebay that takes Williams Guide open sights and combines them with the WGRS apertures to make a barrel-mounted peep with fiber-optic inserts. He includes a FO front sight of the proper height. You could do the same yourself, but he's got it all figured out and the price is about the same, about 65 bucks or so. He sells them for TC round and octagonal barrels. If you don't want the peep, you can just buy the sight sets from Williams. The FO feature isn't "traditional", but neither is a spring loaded adjustable.
