Kampfpistole

The Walther Kampfpistole Z (English: Walther Modified Signal Pistol Z) was an anti-tank pistol developed by Nazi Germany and used during World War II. It was derived from a flare gun and modified to launch HE-rounds.

History
In 1928, the Leutpistole was developed within what would become Nazi Germany. During World War II, several modifications were made to it.

During the Peace Walker Incident in 1974, the Militaires Sans Frontieres managed to procure design specs as a reward from their employers for eliminating enemy units, enemy outposts, tank units, capturing an enemy outpost, defeating medium enemy units, main enemy units, destroying an armored unit, and capturing an enemy facility. They eventually improved upon it by adding a rifle stock to the weapon. After procuring it, the MSF started adopting it as its official weapon for missions outside of Costa Rica.

Behind the scenes
Although the game refers to it as a Kampfpistole, its overall design resembles that of a Strumpistole more.

In-game descriptions
"A combat pistol modified to launch small grenades. Based on a flare gun used by the German Army during the Second World War. Small enough to wield with one hand and holding only a single shot, the Kampfpistole may look somewhat wimpy, but it has enough power to get the job done. It can even hold its own against armored combat vehicles. (Rank 5) A rifle stock has been added for improved accuracy."

- Kampfpistole (Combat Pistol) description from Metal Gear Solid: Peace Walker