This musket has two parallel barrels; each barrel can be shot independently as a separate action, or both can be fired at once as the same attack.

If both barrels are fired at once, they must both target the same creature or object, and the gun becomes wildly inaccurate, taking a –4 penalty on each shot. Each barrel of a double-barreled musket uses either a bullet and a single dose of black powder or an alchemical cartridge as ammunition.