Quoted from Astropin:
Might just be me (I don't know) but I think not having the original gun is huge.....it's also unobtanium.
I was looking at his game, but I ultimately passed for the exact reason you mentioned and the fact that the price didn't reflect the lack of the proper gun. I couldn't get over his game having a semi-auto handgun when all of the artwork is based on the revolver style gun. It is also missing the topper. If you can get past those things it looks to be a pretty decent example.