The musketoon is a shorter-barrelled version of the musket, and served in the roles of a shotgun or carbine. Musketoons could be of the same caliber as the issue musket, or of a much larger caliber, 1.0–2.5 inches (25–63 mm). The musketoon is most commonly associated with naval use, and pirates in particular, though they also served in a carbine role with cavalry. Musketoon barrels were often flared at the muzzle, resembling a cannon or blunderbuss.