The real stuff happens when you beat the game and get access to the Crysler building, where the real final boss is. You'll need 300 pieces of junk collected from dudes to get the best weapon in the game, the AK47. You can get Junk from a certain range of floors in Crysler, but it's a pain in the ass lugging it around, but totally worth it. It has the best stats and is pretty integral through trucking through the 100+ floors of the Crysler building. Side note, the Deagle is pretty good too.
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