A "smoothbore gun" doesn't have to be a hand gun. For example, the M1 Abrams tank (as well as the German Leopard2 tank) has a "smoothbore gun", the German equivalent of which is "Glattrohrkanone". A "smoothbore gun" can also be an artillery piece ("Geschütz"), e.g. the majority of large guns used at the start of the American Civil War, with rifled guns being increasingly deployed later in that war.
See also examples above."
Context = "http://www.army-technology.com/projects/abrams/index.html
M1 ABRAMS ARMAMENT
The main armament is the 120mm M256 smoothbore gun, developed by Rheinmetall GmbH of Germany.
http://www.wehrtechnik.net/wehrtechnik/uran_m...Der Penetrator durchschlägt ebenfalls einen Meter Panzerstahl, aber nur auf Entfernungen von 2.000 Metern, da die 120mm Glattrohrkanone des M1 A2 Kampfpanzers um 1,3 Meter kürzer als die des Leopard 2 ist und über weniger Abschussdruck verfügt.
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http://www.cwartillery.org/ve/brooke.html10-inch Brooke smoothbore gun. Total length, 158.25 inches; weight, 21,300 pounds; total production, 10 (4 by Tredegar and 6 by Selma); known survivors, 2. Tredegar Foundry also cast four 8-inch Brooke rifles, of which none is known to survive, using a pattern whose dimensions were nearly identical to this one.
