[Sam Casey]

I picked up a nice 20ga recently. ST, PG, SFE that by chance my Kreighoff 16ga barrels snap right on. Gun is/was unused & unfired. Have shot it and everything works as it should, except BARREL SELECTOR is stuck in forward (right barrel first) position. Am tempted to give it a squirt of Kroil, but have in my mind that I read somewhere that for some reason I should not "oil" a ST. Would rather not have smith tear gun down as it seems that screws are never tight and correct after. Any advise welcome. If it must go to smith, can anyone recommend a good one in MI?