If you wanted / needed to get a Winchester 1886 re-stocked and wanted the most authentic job possible, where would you send it?
What kind condition is the gun in?
Maybe call Macon Gunstocks?
Treebone sells semi inletted stocks.
http://www.treebonecarving.com/winchester-levergun-stocks.html This could save some time and money over a pure custom if they have what you want. It should also increase the options for who would finish it.