A combination gun is a break-action hunting firearm that comprises at least two barrels, with at least one rifle barrel and one shotgun barrel. Combination guns using one rifle and one shotgun barrel usually are in an over and under configuration. Side-by-side versions are referred to as cape guns. A drilling refers to a combination gun that has t...
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http://en.wikipedia.org/wiki/Combination_gun
A shoulder-held firearm that has two barrels; one rifle barrel and one shotgun barrel. Most combination guns are of an over/under design (abbreviated as O/U), in which the two barrels are stacked vertically on top of each other, but some combination guns are of a side-by-side design (abbreviated as SxS), in which the two barrels sit beside each ot...
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http://en.wikipedia.org/wiki/Glossary_of_firearms_terms
A firearm with various different configurations of rifle and shotgun barrels. See various specific types: Bockb
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http://www.hallowellco.com/abbrevia.htm
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