The USAS 12 is a gun that can be purchased for 1~3 days with credits and forever with Battlefunds.
The USAS has no pump action, fully automatic shotgun. It has higher range, Rate of Fire (RoF) and accuracy than most sother shotguns but sacrafices damage instead.
This gun firies 6 pellets per shell and is prone to run out of ammo fast due to the high RoF so ammo conservation is a must unless you are an assault or one is near by.
The USAS is frowned upon in the Play4free community and many people will flame you for even using it and may burst out into complete rage when killed by it. The most common insult is "USAS Noob."