Originally Posted by K.L. Davis
Carbine - Original term used to name the modified rifles used by the Carabiniers, called a Carabinier Rifle. These rifles were shortened and lightened versions of the current issue rifle. Although they originally chambered the same cartridge as the parent rifle, reduced power loads were made for the Carbines... eventually, this would lead to smaller cased ammunition.
Although many purist say that a "carbine" must be based on a larger parent rifle, most agree that a carbine is a purpose designed rifle that sacrifices ballistic performance for a smaller, lighter package.