Virtual Gunsmith

Being a bookworm that is not fully participating in the real world, I was excited when I saw that The Truth About Guns blog was reviewing some new software. But it turns about that "Ghost Recon: Future Soldier" just has features where you can build up an AR. Not really gunsmithing. Where's the end-user-friendly CAD software that I can design my next pistol and email the file to a machine shop? Real gun geeks would be looking for that.