Walther MPL / MPK

Walther introduced the MP family in the early 1960s as a compact 9x19 mm submachine gun line. The MPL, or long version, and MPK, or short version, were intended for police, security, and military users at a time when many forces still wanted dedicated pistol-calibre automatic weapons. The type competed in a market increasingly dominated by Heckler & Koch's MP5.

The Walther MPL and MPK were selective-fire, open-bolt, blowback-operated submachine guns. The MPL used a longer barrel and sight radius, while the MPK offered a more compact package for close protection and vehicle work. The design was mechanically straightforward, reflecting the submachine-gun priorities of reliability, controllability, and low manufacturing complexity.

Operationally, the Walther MP family found users among police and security organizations, with the two versions allowing different concealment and handling tradeoffs. It did not become as internationally dominant as the MP5, but it remains important as Walther's main Cold War submachine-gun design and a practical example of 1960s West German small-arms engineering.