Walther PPK is an old handgun.
It was copied in South America and imitated in Vietnam. such a variant had double-action on the first shot, with a very rough pull. It was chambered for .22 long rifle, and took lead azide explosive ammunition.
Shin rent such a gun to Case, along with 9 rounds of simple Chinese hollow points. Its grips were bright red plastic molded in a raised dragon motif.