Accuracy and Aimed Fire

All ranged weapons have an
Accuracy (Acc) statistic. This is the
bonus you get if you take one or more
Aim maneuvers immediately before
you attack.
When you Aim, you can receive
other bonuses for extra seconds of
aim, bracing your weapon, or using a
scope or a laser sight. These benefits
are discussed under Aim (p. 364) and
summarized under Ranged Combat
Modifiers (p. 548). The sum of Acc and
all extra aimed-fire bonuses can never
exceed twice the base Acc of the
attack.