The longest rifled barrel is probably the US Navy 16 inch rifles mounted on battleships-with barrels 66 feet long. Land based- the M65 Atomic cannon- with a 42'9" barrel. For shoulder arms, many muzzeloading black powder rifles used barrels in the 46 to 48 inch range. The Barrett .50 cal sniper rifle has a 29 inch barrel- and most civilian sporting rifles are 26 inches or shorter. Longer does not always mean better or more powerful.
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