In a world where Walking Dead and Game of Thrones are doing crazy well, NBC doesn't think that a Sixth Gun series would work?
Not a good move, NBC!
Of course, as commenter Peter notes below, it is fair to note that the comic might not have been adapted well. So my apologies for jumping the sixth gun to "foolishly," NBC! Perhaps you were totally correct! It is just a shame to not see a great comic series get adapted.