The .357 Magnum is a revolver, available inside the mystery box. In the Wild West game mode, you start with it howerver. It has a six bullet capacity, with 60 bullets in reserve. The Pack-a-Punched (PaP) version is the .357 Plus 1 K1l-u, which is a leet-speak spelling of .357 Plus 1 Kill You. The .357 Plus 1 K1l-u features increased damage output, as well as increasing the bullet reserve up to 80.
.357 Magnum

The .357 Magnum, as seen held by a player.

.357 Plus 1 k1l-u

The .357 Plus 1 K1l-u, as seen held by a player.