
A double-barreled shotgun (`double` in context) is a shotgun with two parallel barrels, allowing two shots to be fired in quick succession. ==Construction== Modern double-barreled shotguns, often known as doubles, are almost universally break open actions, with the barrels tilting up at the rear to expose the breech ends of the barrels for unloa.....
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http://en.wikipedia.org/wiki/Double-barreled_shotgun

A shotgun with two barrels, usually of the same gauge or bore. The two types of double-barreled shotguns are over/under (abbreviated as O/U), in which the two barrels are stacked on top of each other, and side-by-side (abbreviated as SxS), in which the two barrels sit beside each other. See photo at right for example of side-by-side double-barrele...
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http://en.wikipedia.org/wiki/Glossary_of_firearms_terms
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