Nipper .38

The Nipper .38 has been seen in official artwork.

Rockstar has not shared more about the Nipper .38 yet. This page grows as new trailers and screenshots come out.

More handguns

Capo pistol
Seen in official screenshots.
ES9
Seen in the Ultimate Edition screenshots.
K17
Seen in the Ultimate Edition screenshots.
Morgan
Ultimate Edition
Seen in the Ultimate Edition screenshots.
Mustang .357
Seen in official screenshots.
Pistol
Seen in the first trailer. Earlier in games including GTA IV, GTA Chinatown Wars and GTA V.