case mouth
... Case head 壳头、弹壳头 Case mouth 弹壳口 Caseless cartridge 无弹壳枪弹 ...
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另外,因为无托步枪退壳口非常接近使用者的面部,当废弹壳跳出时使用者感到非常大的声音、气浪和烟尘。
Additionally, because the ejection port on the bullpup rifle is very close to the user's face, the user would feel greater sound, blast and smoke effects when spent casings eject.
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