Drilling
Definition
A three-barrel firearm arrangement, commonly combining shotgun and rifle barrels but not limited to one layout or chambering. The actual barrels, selector and component relationships must be examined; the name alone does not establish identical marks or independent firing and extraction mechanisms.
Drilling denotes a three-barrel arrangement, often combining shotgun and rifle barrels. Other layouts exist, so the term alone does not establish two shot barrels above one rifle barrel, a particular calibre or a historical military issue configuration.
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