Fat stacks shoots several dollar bills in a straight line towards the angle you are aimed at. After a bit, depending on your power, the bills will drop straight down, damaging enemies. If the bills hit someone before this process, they will take damage. The dollar bills have to hit terrain in order to do damage to yourself, but can hit enemy tanks directly tanks.
The projectiles travel straight for a distance of approximately three times the length of the Power bar of the shot, before falling straight down (in 0 Wind).
A bug exists for all upgrades for Fat Stacks and is seen when shooting the weapon at 0 power when there is no wind. When done so, the dollar bills stay stationary at the end of the tank's barrel until the projectiles despawn or collide with something.
The bug with firing this weapon at 0 power can be utilized with wind in order to hit someone at the same altitude as you.
If this weapon is shot at 0 degrees or lower, the dollar bills don't fall down and instead goes straight back to the shooter, resulting in the shooter damaging themselves unless they happen to be on the top of a hill.
A way to counteract the 0 power bug is by using a weapon that builds land. If a teammate or enemy tank shoots a weapon that build land into the projectiles, the projectiles will collide with the land causing them to disappear. Predicting when someone will do this will be easier as a teammate. Otherwise, you will just have to wait until the projectiles despawn.
Shooting as close to 0 angle as possible will minimize the spread of this weapon. The range of this weapon is just under half the map.
This weapon's damage is distance based.
Because the higher tiers of this weapon have a lower damage cap per projectile, the higher tiers are more effective from a closer range than their prior tiers.
