Here's my crazy prediction.
Near the end, Hank will kill Jesse. In response, Walt will kill Hank. Skyler will find out and try to turn Walt in and Walt will poison her with Ricin. Then he'll contact The Cleaner and disappear.
I can't think of why he needs the heavy guns though and work it into this theory. Maybe Mike is hunting him down and Walt is so delusional to think he'll need a machine gun to kill Mike.
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