The Heckler & Koch MP5K is a personal defense weapon.
NCIS[]
In the NCIS Season 7 finale episode, Rule Fifty-One (episode), the men accompanying Jason Paul Dean are seen wielding Heckler & Koch MP5Ks.
It appeared in the NCIS Season 13 episode, Lockdown (episode).
NCIS: Los Angeles[]
It appeared in the NCIS: Los Angeles Season 1 episode, Burned (episode).
It appeared in the NCIS: Los Angeles Season 2 episodes, Standoff (episode) and Bounty (episode).
It appeared in the NCIS: Los Angeles Season 3 episode, Partners (episode).
It appeared in the NCIS: Los Angeles Season 5 episodes, Between the Lines (episode) and Three Hearts (episode).
NCIS: Hawaii[]
It appeared in the NCIS Hawaii Season 1 episode, Paniolo (episode).