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The metal or plastic case that holds the bullet, gunpowder, and primer as part of firearm ammunition. Together the parts are called a round or cartridge, though commonly 'round' and 'bullet' are used interchangeably (the bullet is technically only part of a round).
On Danbooru, most often seen empty, being ejected one at a time from a semiautomatic firearm or shotgun, in a rapid sequence from an automatic firearm, or manually ejected from a revolver cylinder (all at once, typically six at a time).
See also
The following tags are aliased to this tag: bullet_casings and shell_casings (learn more).
The following tags implicate this tag: casing_ejection (learn more).
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