The UMP-45 is the second most popular gun in the game Counter Strike: Global Offensive. It is a submachine gun of German origin. Famous for its high fire rate and low recoil, it is often used by Counter-Strike players. The briefcase is one of the most popular cases in this game, and was painted with a desert template. Exchange your Soul Gems for StatTrak™ UMP-45 | Briefing. The UMP-45 is the best friend of the Terrorists in the game Counter-Strike: Global Offensive. This rifle, also known as "The Briefcase", has a magazine capacity of 25 shots and its silencer reduces recoil and noise. It was painted with a detailed camouflage pattern and it's one of the most popular weapons on our website. The UMP45 is the most modern submachine gun in service with law enforcement and military forces worldwide. It is a high-powered, large caliber SMG, delivering superior performance and fire-power compared to other SMG's. It has been stencilled with a target designator on the left side of the weapon. This custom weapon was painted with a green metallic paint job. If you want this item, you can exchange your Soul Gems for it.