MP5

The Heckler & Koch MP5 is a purchasable gun for Humans.

Appearance
It is a black submachine gun with a medium gray clip.

Trivia

 * At $900, it is the most expensive of the SMGs
 * It was the first automatic weapon in the game
 * In real life, the MP5 is a widely used submachine gun chambered for the 9×19mm Parabellum, 10mm Auto, and .40 S&W cartridges. More information can be found here.