The creature fires an aimed shot or a controlled automatic burst from the shoulder. Only a single hit roll is performed, even if multiple shots are fired. It's either hit or miss.
Target must be within Line of Sight.
From Point-Blank Range (PBR) to Average Range (AR), ranged attack hit rolls are DEX based.
From Medium Range (MR) to Extreme Range (EXR), ranged attack hit rolls are PER based.