The Sawed-Off Shotgun is a hitscan projectile weapon used by the Technician class in Tribes: Ascend.
"The sawed-off shotgun deals incredible damage at close range." In-game Description.
Operation
The Sawed-Off deals hitscan damage which means that it will hit it's target the instant the trigger is pulled. It's range is quite limited however, and it's shells will drop off at medium range. This weapon is effective at hitting targets in midair, and can easily kill a light class using two shells. The weapon holds one shell in each chamber which are fired in sequence, after which the Technician reloads both chambers at once.
Tactics
This weapon seems to be overlooked by most, but with a little work it lives up to it's ingame description. A full hit can deal 80*8, that's a hitscan 640 damage - with another shell instantly ready in the chamber. Patience is key however, and it is a common mistake at first to rush the shots. It pays to make sure your aim is true, and close in some rather than wasting the shots.