Mate, it's not because it's not new or different that he doesn't have the right to do it.
Sometimes when it comes to creating, it doesn't necessarily have to be new or different, it might be a boring and abused item such as a plain old armalite yet what really matters is how the artist feels about it.
Andy Warhol was one of the key figure of Pop-art and is world reknown yet one of the thing that made him popular was his Campbell's Soup cans paintings. He painted just an ordinary object, just like the real one and today those paintings are worth millions. I'm not saying that that guy's M4 or Mwhatever might eventually be worth millions, I'm saying that it's ok to model ordinary, not new and not different objects and we should respect the artist for his art.
WE AIN'T DEAD