Mossberg 500 Variant – BioShock
I love the way 2K Games has paid attention to minute details in BioShock. The shotgun in the game actually tells the story of how much time their designer must have spent when he took the blueprints of the Mossberg 500 shotgun, and modified it both aesthetically and functionally to suit the world of Rapture.
Don’t be mistaken though – this gun is not just eye candy. Modify the gun fully through the course of your game, and you’ll have one of the most powerful weapons you’re ever going to wield in Rapture. Each modification is visually apparent, making the gun bulkier and sexier looking, while adding a huge amount of power. To top it all, depending on the type of enemy you’re up against, you can pick the kind of ammo you need – from Electric Buck, 00 Buck and Explosive Buck. Now THAT'S customization for you!
Now there should be an article on most innovative weapons if it still hasn't been written 
