Other sub-machine guns are seen in Cowboy Bebop but I chose to highlight the Uzi and the MP5 because they stood out among the other designs.

Note: The Uzi originates from Israel and is produced by IMI, the
same manufacturer of Spike's Jericho pistol. Also, while the MP5 is classified as an SMG, it really is a miniaturized assault rifle firing a pistol round (9mm Parabellum). The original roller-lock delay system of the G3 rifle was adapted and scaled-down to a compact SMG scale. The MP5K is a further scaled-down system of the original G3 design whilst retaining the legendary reliability and accuracy of the original, a remarkable achievement.