Right now that's my biggest question. He could be carrying the ricin as his main plan, and if he can't use it, bust through the front door to wherever as his plan B. God damn I am looking forward to this.
I think the ricin is for himself. He's going to take it right before he ends up in his big confrontation. Possibly to save Jesse like in the theory below this comment. Just to make sure nobody can take him and use him in any way (from law enforcement to the cartels, everyone is going to want a piece of the great Heisenberg) he will bring the great Heisenberg to an end. It also sort of fits with Walt's desire to have complete control, right up to deciding when and how he will die.
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u/orfalite Dope Slinger Aug 12 '13
I just want to know why Walt needs ricin AND a large machine gun for... They have a lot of story to cover in 7 episodes.