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the spiral grooves formed in the bored of a firearm barrel that impart spin to the projectile when it is fired
the diameter of the bore of a rifled firearm; the caliber is usually expressed in hundreths of an inch or millimeters
size designation of a shotgun, originally the number of lead balls with the same diameter as the barrel that would make a pound
uses a revolving cylinder containing multiple firing chambers; cartridge cases are not automatically ejected by a revolver
or handgun, consists of a barrel, a firing mechanism, and a grip; 3 types of shots: single-shot, revolver, and semi-automatic
can fire several shots without reloading; automatically expels cartridge casings
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