So I bought the ghost M4 and it performs to every expectation. The only thing that I can dislike is the scope. Era isn't a realistic life but the scope is that of a sniper rifles and doesn't even fit with any head realistically.
My suggestion would be to instead add a red dot sight which would be a bit more sleek and able to fit the head.
Another suggestion as a plus would be to add an optional skin. Being second in highest price it could use a skin or two.
~Ventus