It too recieved an amazing speciman of an SKS.
No refurbish marks at all.
Trust me, if I can strip and clean this thing, you will have no problems.
The firing pin block WILL be packed with Cosmoline and the FP will not rattle likes it is supposed to do. Take it apart to full clean.
One tip I found on the web that worked great for cleaning the barrel was to get a 12" section of 4" dia PVC, a 4" x 3" PVC coupler, a 17" section of 3" dia PVC and a 3" PVC cap. Glue (PVC solvent) them all together and tada.........you have a custom built container to hold barrel while soaking in Mineral Spirits (it works great).
A 4" PVC cap makes a nice cover to prevent spillage.
This pipe resouiver (sp) holds just under 3.78L.
Hope this helps.