The HK MP5 is a widespread and popular sub-machine gun producing a range of variants and is in service with over 60 different countries. The MP5 and the shortened varient the MP5k appear in Call of Duty 4, Modern Warfare 2, Call of Duty: Black Ops and Call of Duty: Modern Warfare 3. Unlocked early in multiplayer and able to accept all sub-machine gun attachments the MP5 is a reliable and extremely versatile weapon.
Fanon Games the MP5 is featured in;
Call of Duty: From the Cold - Appears to be able to support a Underslung Grenade Launcher