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In page Carbine:

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In some historical cases, the term machine carbine was the official title for submachine guns, such as the British Sten and Australian Owen guns. The semiautomatic-only version of the Sterling submachine gun was also officially called a carbine. The original Sterling semi-auto would be classed a short-barrel rifle under the U.S. National Firearms Act, but fully legal long-barrel versions of the Sterling have been made for the U.S. collector market.[citation needed]