Flamethrower On Floodgate (Mission 5)
After you kill the flood in the warehouse near the begining of the mission, you go up some stairs and across a catwalk. Along this catwalk is a flamethrower. Pick it up (it will change to 3rd person view) because it is the best weapon in the game for killing flood, and when you drop the flamethrower you still have the two weapons you had before you picked it up.
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