The MP5K is one of the submachine guns that are used in 007: Everything or Nothing. It has a small magazine but is quite strong. It can stop a person with one shot, and bring him down with the next.
In 007: Nightfire the MP5K appears in the game as the "Deutsche M9K", and has a 21-round magazine (despite the real MP5K having only 15 or 30-round box magazines) and a removable silencer.
Bond uses the M5PK in Tomorrow Never Dies during the final gunfight in the film.