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Lebron, The frame of this PPK/S is constructed of steel. The slide is made of a lightweight zinc alloy to reduce the weight of the slide enough to cycle reliably with rimfire ammunition. https://www.americanrifleman.org/articles/2014/6/4/walther-ppks-22-long-rifle-review/
Lebron - the frame is made of stainless steel, then nickle plated. The 'black synthetic' refers to the grips/grip material. This pistol has what is widely recognized as the best 'out-of-the-box' trigger of any .22 pistol made.
Nickel plated steel frame with a Alloy slide the S stands for sport and no one lese including the Walther site mention "black synthetic" which could be referring to the black plastic grips