[PeteB570]

I went through to the end (post 50) and so far nobody has mentioned the -

Automatic Revolver.

Yes folks, there is one.

[Shooter 2.5]

Italian made semi-automatic Mateba in .357 Magnum.

Check my profile page.

In the "Maltese Falcon", the murder weapon is a semi-automatic Webley-Fosbery.
http://www.findarticles.com/p/articles/mi_m0BQY/is_10_50/ai_n6180939

[Grut]

Automatic Revolver.

Yup. Webley-Fosbery. How about the Dardick magazine-fed revolver?