The UMP-45 is a powerful and light submachine gun that has high accuracy and rate of fire, but it is often criticized for its low damage. The weapon was covered with indigo paint and decorated with stickers. Exchange your Soul Gems for the Souvenir UMP-45 Indigo. The UMP-45 is a submachine gun of German production. It was created in the early 2000s and has proven itself to be a very reliable, high-quality weapon. Its main advantage is that it can be easily adapted to almost any situation. It was decorated with custom stickers of indigo color. Exchange your Soul Gems for the Souvenir UMP-45 Indigo.