Probably the most iconic FPS weapon of all time would be the BFG 9000 from Doom. It's famous for its destructive power, but ...
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Also part of the Doom Anthology SteelBook is an awesome replica of the Doom series' BFG. The gun made a cameo in Quake II with the shooter's manual stating BFG stands for "Big, Uh, Freakin' Gun".