|Benefit||-1 to AP cost of single shots (one-handed weapons); -2 to AP cost of single shots (two-handed weapons); +5 flat damage bonus;+5% AP Regen.|
|Penalty||Firing Aimed Attacks becomes impossible, -35 critical roll while attacking|
You don't have time to aim for an Aimed Attack, because you shoot faster than normal people.
With Fast Shot, your attacks cost one AP fewer than they normally would when using one-handed weapons, and two APs fewer when using two-handed weapons. Moreover, you inflict an additional 5 points of damage on a per-attack basis whenever you hit your target. The trade-off is that you lose the ability to perform any sort of Aimed Attacks.
Fast shot does not reduce the AP cost of bursting or of weapons that cannot do Aimed Attacks, such as rocket launchers or either of the weapons that fire 40mm Grenades. It does apply to thrown weapons, but only those that could normally be used to perform an Aimed Attack, e.g. throwing knives. All weapons benefit from the +5 flat damage bonus, however.
Penalty to critical roll applies to all type of attacks, not only single shots.