Evolution of the Batmobile -- I have always loved the original 66 for the fact that it would be the easiest to fix/replace. Throw a diesel in for even simpler operation. But that would not sell tickets.
Replacing the was a gigantic waste of money and a step backwards in my opinion. There is something to be said about belt fed capability and also having the ability to accept standard 30 round magazines. Not to mention the quick change barrel.