The design inspired other pistols, among them the Soviet Makarov, the Hungarian FEG PA-63, the Polish P-64, the American Accu-Tek AT-380 II, and the Argentinian Bersa Thunder 380. The PPK is still manufactured by Walther, but the PP went out of production in 1999 and have been widely copied. The PP and the PPK were among the world's first successful double action semi-automatic pistols. Since 2018, PPK and PPK/S models have been built at the factory of US-based subsidiary Walther Arms, Inc. In the past, the PPK version was manufactured by Walther in its own factory in Germany, as well as under licenses by Manurhin in France Interarms in Virginia, and by Smith & Wesson in Maine. Various PP series are manufactured in Germany, France and the United States. The Walther TPH pocket pistol is a smaller calibre pistol introduced in 1971 which is identical in handling and operation to the PPK. The series includes the Walther PP, PPK, PPK/S, and PPK/E models. It features an exposed hammer, a traditional double-action trigger mechanism, a single-column magazine, and a fixed barrel that also acts as the guide rod for the recoil spring. The Walther PP ( German: Polizeipistole, or police pistol) series pistols are blowback-operated semi-automatic pistols, developed by the German arms manufacturer Carl Walther GmbH Sportwaffen. Fixed iron sights, rear notch and front blade
