The Walther PP series pistols are blowback-operated

Blowback (arms)

Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge....

 semi-automatic pistols.

They feature an exposed hammer, a double-action trigger mechanism, a single-column magazine, and a fixed barrel which also acts as the guide rod for the recoil spring. The series includes the Walther PP, PPK, PPK/S, and PPK/E.

They are manufactured by Carl Walther GmbH Sportwaffen in Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, Manurhin

Manurhin

Manhurin is currently a trademark used by Manufacture d'Armes de tir Chapuis beginning in 1998, and located in Saint Bonnet Le Chateau, France.-History:...

 in France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 following World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, and then in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 by Interarms in Alexandria, Virginia

Alexandria, Virginia

Alexandria is an independent city in the Commonwealth of Virginia. As of 2009, the city had a total population of 139,966. Located along the Western bank of the Potomac River, Alexandria is approximately six miles south of downtown Washington, D.C.Like the rest of northern Virginia, as well as...

 and currently Smith & Wesson

Smith & Wesson

Smith & Wesson is the largest manufacturer of handguns in the United States. The corporate headquarters is in Springfield, Massachusetts. Founded in 1852, Smith & Wesson's pistols and revolvers have become standard issue to police and armed forces throughout the world...

.