The term 'long-barrelled gun' can refer to two different types of firearms: a MUSKET and a RIFLE. A MUSKET is a muzzle-loading, smoothbore firearm that was used in the 16th to 19th centuries. It typically has a long barrel and is fired from the shoulder. A RIFLE is a firearm with a rifled barrel that is designed to be fired from the shoulder. It is more accurate than a MUSKET and is used for hunting and target shooting.