Heckler & Koch UMP

The Heckler and Kock UMP is a submachine gun developed during the 1990s. It is chambered for various rounds, ranging from 9x19 parabellum up to .45 ACP

Resident Evil: Operation Raccoon City
The UMP, called the "Tactical Submachine gun," was first revealed on the website for the Kendo Gun Store, which can be found though the Inserted Evil minigame. It is unknown which round it fires in-game. It is likely the last smg to be unlocked.