Is there any tutorial about modeling pistol or rifle using Rhino?

I want to learn modeling guns using Rhino. I need a tutorial. This image is a polygonal 3d pistol and I want to try it using Rhino. I’m sure that Rhino will produce much better and more precise result than polygonal method.

There’s nothing special about the shape of a firearm. The regular tutorials will cover all the skills you need.
I’d start with the User’s Guide. You can grab it off the Learn page.