It can be found by Chris Redfield, Piers Nivans and Ada Wong. Chris and Piers can find this weapon in Chapter 2 in a room if the player decides to go back from where they were chased by the Ogroman. However, if the player misses it, the weapon can be obtained in the City Hall in a room where the J'avo burst out of. While in Ada's campaign, it can be found in Chapter 1 just before Ada's attempt to escape the submarine.