腔こう線せんこうせんじ字FuriganaMeanings1noungun riflingTechnical term for the spiral grooves inside a gun barrel that impart spin to a projectile.腔こう線せんの摩ま耗もうが命めい中ちゅう精せい度どに影えい響きょうする。Wear of the rifling affects accuracy.
