The PPK/S was developed following the enactment of the Gun Control Act of 1968 (GCA68) in the United States, the pistol's largest market. One of the provisions of GCA68 banned the importation of pistols and revolvers not meeting certain requirements of length, weight, and other "sporting" features into the United States.
The PPK failed the "Import Points" test of the GCA68 by a single point. Walther addressed this situation by combining the PP's frame with the PPK's barrel and slide to create a pistol that weighed slightly more than the PPK. The additional ounce or two of weight of the PPK/S compared to the PPK was sufficient to provide the extra needed import points. For more information please click here.
You can download this paper model template here: Full Size Walther PPK/S Pistol Free Paper Model Download [YaDisk]