vierling

German Vierling (“gun with four barrels; quadruplet”).

vierling (plural vierlings)

1. A long firearm with four barrels (typically two shotgun barrels and two rifle barrels).

   Coordinate term: drilling

   • 2009, Nebraskaland, volume 87, page 32:

     The vierling gun that Alan Tuck hunts with is truly a handcrafted work of art.

   • 2015, Robert A. Sadowski, Gun Trader's Guide to Shotguns: A Comprehensive, Fully Illustrated Reference for Modern Shotguns with Current Market Values, Simon and Schuster, →ISBN:

     The Blaser D99 drilling can be custom made with two side-by-side shotgun barrels and a rifle barrel over them. Another variation on the multiple barrel shotgun is the vierling, which is the German word for quadruplet. A vierling has four barrels  […]

   • 2018, James Ballou, Arming for the Apocalypse: Assembling Your Survival Arsenal ... While You Still Can, Prepper Press

     […] three-barreled drillings, the two-barreled shotgun/rifle cape guns, and the four-barreled vierlings, which all featured some combination of rifle with shotgun barrels within the same gun.

• livering, reliving, reviling, riveling

From vier (“four”) +‎ -ling, modeled after tweeling.

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vierling m (plural vierlingen, diminutive vierlingetje n)

1. quadruplet; one of a group of four babies born from the same mother during the same birth.