单词	rifling
释义	rifling /ˈrʌɪflɪŋ / noun [mass noun] The arrangement of spiral grooves on the inside of a rifle barrel: he could clearly see the rifling of the bore... There's no rifling in the barrel, and you call it a rifle? The foremost portion of this auxiliary chamber incorporates many small rifling grooves to just stabilize the bullet before it engages the bore. In their six grooves, Colerain barrels feature round bottom rifling that holds less fowling; square bottomed grooves reportedly retain more fowling.
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