This pistol has two parallel barrels; each barrel can be fired independently as separate attacks, or both can be fired at once as a standard action (the attack action).
If both barrels are shot at once, they must both target the same creature or object, and the pistol becomes wildly inaccurate, imparting a –4 penalty on each shot.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.