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F stands for the model introduced to USA, S stands for the army tests modifications

F also signifies that the gun will have a safety and decocker. As opposed to the G model which only comes with a decocker and no safety

Here are an overview of the 4 basic models: Type C: So-called to be Single-action-only ("Constant Action" - hammer is in half-cocked position). Spurless hammer. No decocker. No safety. Type D: Double-action-only. Spurless hammer. No decocker. No safety. Type F: Single and double-action. Decocker. Manual safety. Type G: Single and double-action. Decocker. No manual safety.

You will need an adapter to use the same magazine in the Carbine but yes the magazines are compatible. www.berettasupport.com

According to Beretta: Type F - The traditional Beretta Type F system (as found on the legendary Beretta 92FS/M9 pistol) is single/double action with an ambidextrous manual safety on the slide which also acts as a decocking lever. Type C - The Beretta Type C (Constant action) system is a double action only variant but with a shorter trigger travel and lighter trigger pull than conventional DAO trigger mechanisms. This Type has no external safety/decocking lever. Source: http://www.berettausa.com/assets/39/29/Storm_BORE.pdf