I once read Oliver Stone's original screenplay of the movie, which follows the final product(and deleted scenes on the DVD). If anything, Montana is actually a bigger toilet bug of a thug but thats what I observed.

As for Stone's "bullshit" with the ending, really thats what I liked about it back at the time I read it. An Uzi and a Bazooka?!?!?!

Anyway, I do agree that DePalma's change from those two weapons to a grenade-launching assault weapon is better.