Ghostrider,
That is the type of steel the barrel is made from. It translates to "fluid steel, Krupp (the steel company) Essen (location of the steel company, a city in the Ruhr River valley)".
Mike
Mike, Krupp fluid steel barrels were marked FLUSS STAHL, which I'm certain you know. The term on this rifle is GUSS STAHL which translates to cast steel. I don't recall ever seeing this term on any Krupp Steel barrels before. Maybe I just glanced at it quickly, and assumed as you did that it said Fluss Stahl.
