The MP5A3, used by the Bundeswehr during the Belkan War.
The Heckler & Koch MP5, or MaschinenPistole 5, was, for several decades, the most widely used submachinegun in the Strangereal World, even more so than the iconic Uzi. This Ustian-produced 9mm SMG entered military service in 1959, and was not phased out until well into the first half of the 21st century.